PureCare’s SUB-0 degree pillows are a hybrid of technical textiles and premium fills, fusing cleanliness with cooling comfort. The SUB-0 degree 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.