PureCare’s SUB-0°® pillows are a hybrid of technical textiles and premium fills, fusing cleanliness with cooling comfort. Each SUB-0° hybrid cover blends PureCare’s exclusive FRíO rapid chill cooling fibers along with the ultra plush feel of TENCEL® threads, resulting in a luxury responsive textile that is more absorbent than cotton, softer than silk and cools five times faster than traditional polyester. The SUB-0° Down Complete pillow features a down proof inner lining that locks the Ultra-Fresh treated down & feathers in place for consistent comfort and proper support. Machine washable, each cover is treated with antimicrobial silver chloride that inhibits bacteria, mold, and mildew that cause deterioration, stains and odors on this product.