Cotton Flannel Sheets

Cotton Flannel Sheets | Warm, Cozy Flannel Sheet Sets

Welcome cooler nights with warm cotton flannel sheets brushed for exceptional softness. Cozy, breathable comfort makes them a seasonal favorite for winter and cool sleepers.

Sheet Sets Flat Sheets Fitted Sheets Duvet Covers Pillowcases
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Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover - White, Twin/Twin XL,White
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Company Cotton™

Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover

From $124.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.688 out of 5 stars
Rating Count: 282
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set - White, Twin,White

+ 7

+ 9
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Berries and Leaves

+ 2

+ 4
Company Cotton™

Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $139.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.66 out of 5 stars
Rating Count: 153
Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set,Walter

+ 0

+ 0
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set

From $154.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.916 out of 5 stars
Rating Count: 95
Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set,Brad

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+ 0
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set

From $154.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.916 out of 5 stars
Rating Count: 95
Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set,Scot

+ 0

+ 0
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set

From $154.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.916 out of 5 stars
Rating Count: 95
Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover,Scot

+ 0

+ 0
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover

From $139.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.813 out of 5 stars
Rating Count: 75
Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover,Berries and Leaves

+ 0

+ 1
Company Cotton™

Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover

From $124.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.626 out of 5 stars
Rating Count: 131
Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover,Walter

+ 0

+ 0
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover

From $139.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.813 out of 5 stars
Rating Count: 75
Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover,Brad

+ 0

+ 0
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover

From $139.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.813 out of 5 stars
Rating Count: 75
Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet - White, Twin,White
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Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet

From $54.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.697 out of 5 stars
Rating Count: 445
Classic Ultra-Cozy Cotton Flannel Pillowcase Set Classic Ultra-Cozy Cotton Flannel Pillowcase Set - White, Standard,White
Best Seller

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Company Cotton™

Classic Ultra-Cozy Cotton Flannel Pillowcase Set

From $49.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.755 out of 5 stars
Rating Count: 335
Classic Ultra-Cozy Cotton Flannel Flat Bed Sheet Classic Ultra-Cozy Cotton Flannel Flat Bed Sheet - White, Twin/Twin XL,White
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Classic Ultra-Cozy Cotton Flannel Flat Bed Sheet

From $54.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.749 out of 5 stars
Rating Count: 307
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Oatmeal

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Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover - Winter Plaid, Twin/Twin XL,Winter Plaid
New Color
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover

From $124.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.813 out of 5 stars
Rating Count: 75
Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set - Winter Plaid, Twin,Winter Plaid
New Color
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set

From $139.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.916 out of 5 stars
Rating Count: 95
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Ivory

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Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Willow Green

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Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Evening Forest
New Color

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Company Cotton™

Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $139.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.66 out of 5 stars
Rating Count: 153
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Seafoam

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Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Powder Blue

+ 7

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Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,White

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Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet,White
Best Seller

+ 7

+ 9
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet

From $54.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.697 out of 5 stars
Rating Count: 445
Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover,Evening Forest
New Color

+ 0

+ 1
Company Cotton™

Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover

From $124.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.626 out of 5 stars
Rating Count: 131
Luxe Ultra-Cozy Cotton Velvet Flannel Flat Bed Sheet Luxe Ultra-Cozy Cotton Velvet Flannel Flat Bed Sheet White, Deep Pocket Queen,White
Best Seller

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Legends Luxury™

Luxe Ultra-Cozy Cotton Velvet Flannel Flat Bed Sheet

From $109.50
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.777 out of 5 stars
Rating Count: 804
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Teal

+ 7

+ 9
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover,White
Best Seller

+ 6

+ 8
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover

From $124.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.688 out of 5 stars
Rating Count: 282
Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover,Ivory
Best Seller

+ 6

+ 8
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover

From $124.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.688 out of 5 stars
Rating Count: 282
Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set,Winter Plaid
New Color

+ 0

+ 0
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Bed Sheet Set

From $139.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.916 out of 5 stars
Rating Count: 95
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Slate Blue

+ 7

+ 9
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover,Winter Plaid
New Color

+ 0

+ 0
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Duvet Cover

From $124.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.813 out of 5 stars
Rating Count: 75
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Amber

+ 7

+ 9
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Premium Ultra-Cozy Cotton Velvet Flannel Bed Sheet Set Premium Ultra-Cozy Cotton Velvet Flannel Bed Sheet Set,White
Best Seller

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+ 0
Legends Hotel™

Premium Ultra-Cozy Cotton Velvet Flannel Bed Sheet Set

From $119.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.851 out of 5 stars
Rating Count: 470
Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Winter Day
New Color

+ 2

+ 4
Company Cotton™

Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $139.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.66 out of 5 stars
Rating Count: 153
Classic Plaid Ultra-Cozy Cotton Flannel Fitted Bed Sheet Classic Plaid Ultra-Cozy Cotton Flannel Fitted Bed Sheet - Winter Plaid, Twin,Winter Plaid
New Color
Company Cotton™

Classic Plaid Ultra-Cozy Cotton Flannel Fitted Bed Sheet

From $59.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.727 out of 5 stars
Rating Count: 33
Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Floral Spray
New Color

+ 2

+ 4
Company Cotton™

Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $139.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.66 out of 5 stars
Rating Count: 153
Classic Ultra-Cozy Cotton Flannel Pillowcase Set Classic Ultra-Cozy Cotton Flannel Pillowcase Set,White
Best Seller

+ 6

+ 8
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Pillowcase Set

From $49.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.755 out of 5 stars
Rating Count: 335
Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover,Teal

+ 6

+ 8
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover

From $124.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.688 out of 5 stars
Rating Count: 282
Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Deer Path
New Color

+ 2

+ 4
Company Cotton™

Holiday Print Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $139.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.66 out of 5 stars
Rating Count: 153
Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover,Willow Green

+ 6

+ 8
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover

From $124.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.688 out of 5 stars
Rating Count: 282
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Rust

+ 7

+ 9
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet,Willow Green
Best Seller

+ 7

+ 9
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet

From $54.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.697 out of 5 stars
Rating Count: 445
Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover,Slate Gray
Best Seller

+ 6

+ 8
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover

From $124.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.688 out of 5 stars
Rating Count: 282
Classic Ultra-Cozy Cotton Flannel Bed Sheet Set Classic Ultra-Cozy Cotton Flannel Bed Sheet Set,Slate Gray

+ 7

+ 9
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Bed Sheet Set

From $129.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.702 out of 5 stars
Rating Count: 725
Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover,Slate Blue

+ 6

+ 8
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover

From $124.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.688 out of 5 stars
Rating Count: 282
Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover,Deer Path
New Color

+ 0

+ 1
Company Cotton™

Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover

From $124.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.626 out of 5 stars
Rating Count: 131
Classic Ultra-Cozy Cotton Flannel Pillowcase Set Classic Ultra-Cozy Cotton Flannel Pillowcase Set,Oatmeal
Best Seller

+ 6

+ 8
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Pillowcase Set

From $49.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.755 out of 5 stars
Rating Count: 335
Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover,Rust

+ 6

+ 8
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover

From $124.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.688 out of 5 stars
Rating Count: 282
Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover,Powder Blue

+ 6

+ 8
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Solid Duvet Cover

From $124.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.688 out of 5 stars
Rating Count: 282
Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover,Floral Spray
New Color

+ 0

+ 1
Company Cotton™

Holiday Print Classic Ultra-Cozy Cotton Flannel Duvet Cover

From $124.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.626 out of 5 stars
Rating Count: 131
Luxe Ultra-Cozy Cotton Velvet Flannel Duvet Cover Luxe Ultra-Cozy Cotton Velvet Flannel Duvet Cover White, King/Cal King,White
Best Seller
Legends Luxury™

Luxe Ultra-Cozy Cotton Velvet Flannel Duvet Cover

From $239.00
Black Friday Sale: 25% Off $100+ with Code: BFDEALS26
Average Rating: 4.69 out of 5 stars
Rating Count: 216
Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet,Ivory
Best Seller

+ 7

+ 9
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet

From $54.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.697 out of 5 stars
Rating Count: 445
Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet,Slate Blue

+ 7

+ 9
Company Cotton™

Classic Ultra-Cozy Cotton Flannel Fitted Bed Sheet

From $54.00
Epic Deals: 40% off with Code: BFDEALS26
Average Rating: 4.697 out of 5 stars
Rating Count: 445
Showing 53 of 125 Products

Flannel Sheets So Cozy You’ll Look Forward to Winter

The first chilly evening is the perfect excuse to trade lightweight bedding for brushed cotton flannel sheets that welcome you to bed with instant warmth. Better yet, our flannel sheets become even cozier with every wash, developing the relaxed, lived-in softness that flannel fans can’t get enough of.

Whether you prefer our signature Velvet Flannel with its compulsively touchable texture or heavyweight 6-ounce cotton flannel sheets that hold in extra warmth, you'll find flannel sheet sets, fitted sheets, and flat sheets in a wide range of colors, prints, and sizes. Pair them with your favorite comforter or duvet and enjoy cozy nights all winter long.

Flannel Sheets Q&A

What Is a Good Thread Count for Flannel Sheets?

Flannel sheets are not measured by thread count, but by weight. Look for flannel sheets with a weight of at least 170 GSM (grams per square meter), or 5 oz.

What are good quality flannel sheets?

Flannel sheets are described by weight, with most weighing between 4 and 6 oz. Flannel sheets with a heavier weight are warmer, higher quality, and longer lasting.

How long do flannel sheets last?

Like most sheets, flannel sheets will last about three years. The higher the weight, the higher the quality—and the longer they’ll last. Plus, flannel sheets get better with time: they’re softer and cozier after each wash.

Flannel vs. Cotton sheets: What is the difference?

Cotton is a type of fiber, while flannel is a type of fabric woven with cotton yarn. Because flannel sheets are woven with a thicker yarn, they’re warmer than other cotton sheets.