Looking to sell a Twin XL Translucent 10 "Gel (2.5") Memory Foam Mattress. It is rated medium firmness, although it appears to be more supple than firm. The cover is detachable and washable. The mattress was in use for around a year and a half with regular washing before being removed and put away. Though kept clean, some light pillaging of the navy-blue flannel sheets was stuck on the cover.