We sell our memory foam and hybrid mattresses in all standard sizes, including twin, twin XL, full, queen, king, and California king. We even sell our standard king size mattresses in a split king option, so couples with different sleep needs can find their ideal mattress model for their side of the bed. (Plus, split king mattresses offer more flexibility with king size adjustable beds!) The dimensions for our Amerisleep mattress sizes are as follows: Twin — 38 inches by 74 inches. Twin XL — 38 inches by 80 inches. Full — 54 inches by 75. inches Queen — 60 inches by 80. inches King — 76 inches by 80. inches California king — 72 inches by 84 inches.