King size 20 x 36” MAIN MATERIALS: Shell Fabric - 100% cotton, 300-thread count. Inner Chamber Fill - white duck feather, Outer Chamber Fill - white duck-down. SIGNATURE STRIPE: Woven cotton with our classic damask texture for a heritage-inspired look. FEATHERLOCK FABRIC: Downproof shell woven to keep down & feathers in and allergens out. PERFORMANCE POWER: Filled with white duck down (550 fill power) for light warmth and breathable comfort. CHAMBERED CONSTRUCTION: Pillow-within-a-pillow design melds lofty softness with supportive structure. STRUCTURED SHAPE: Gusseted edges create a box-like silhouette elevated for lasting loft and enhanced neck support. DELIBERATELY DESIGNED: Engineered for durability and improved spinal alignment—ideal for shams and sleepers who crave a consistent, balanced feel. HEALTHY HOME: Our down & feathers are meticulously cleaned to help reduce common irritants so you can rest easy. CONSCIOUS COTTON: By choosing our cotton products, you’re supporting our investment in Better Cotton’s mission. This product is sourced via mass balance and therefore may not contain Better Cotton. SUSTAINABLY SOURCED: Fill contains 100% RDS certified down & feather. Certified by Bureau Veritas TE-00021176. TEXTILE TESTED: OEKO-TEX® STANDARD 100: tested against 1000+ harmful substances to keep you and your family safe from chemicals common to textile manufacturing. AMERICAN ASSEMBLY: Filled & Finished in the USA with domestic and imported materials.