Design Weave Outlast All Season Temperature Regulating Pillowcases in Lake Blue, King 300-thread count, 40% Outlast 60% Cotton sateen weave Outlast technology absorbs, stores & releases heat Balances temperature around your body and maintains optimal sleep temperature. Provides thermal compatibility with your partner Hypoallergenic construction to resist dust mites and other allergens Includes: 20 x 40in Two King Pillowcases Questions/Comments? Please call our customer service number directly at 888-288-8781.