【HIGH-QUALITY TENCEL PROTECTOR】The mattress cover is made of 44% Tencel and 56% polyester fiber, which is skin-friendly and breathable 【DUAL-SIDED SLEEP MATTRESS】 Baby's good sleep is closely related to a comfortable mattress. In order to better accompany baby's growth, our crib mattress adopts a double-sided sleep design. The firmer side suitable for infants, and the softer side for toddlers 【EASY TO REMOVE & CLEAN】 Comes with a removable ultra-soft tencel mattress cover and waterproof non woven fabric lining. The zipper design makes the cover easy to remove and install. And the bed cover can be machine-washed 【BREATHABLE UPGRADE DESIGN】The mattress is made of CertiPUR-US certified high quality foam with ventilation holes, which is odorless and breathable 【STANDARD SIZE CRIB MATTRESS】Baby mattress dimensions are 52" x 27.5" x 4.7". Fits full-size cribs and toddler beds Babelio Crib Mattress, Toddler Mattress for Toddler Bed, Memory Foam Baby Mattress, Dual Sided with Tencel Cover & Waterproof Lining