Breathable Baby Crib Mattress, Cooling Sheet for Baby Night Sweats, Washable & Removable Waterproof Cover, CertiPUR-US Certified Firm Foam, Fits Standard Full-Size Infant & Toddler Bed About this item 【REFRESHING COOLING SHEET】：The cooling sheet is designed to help regulate baby's temperature, keeping them comfortable and ensuring a peaceful night's sleep, preventing baby from getting too warm and sweaty while they sleep. This cooling effect is especially important during the hot summer months, but can be useful year-round. 【CERTIPUR-US CERTIFIED FOAM】: We put baby's safety first.CertiPUR-US certified, which means products are free from harmful chemicals and materials. Rest easy knowing that your baby is sleeping on a mattress that is safe, healthy, and made with high-quality materials. 【WATER-RESISTANT OUTER COVER】: The water-resistant unzip outer cover on this crib mattress is designed to protect the mattress from spills, leaks, and accidents. It's soft, removable, washable, so you can keep your baby's sleeping environment clean and healthy. 【BREATHABLE FOR BABY】: There're holes on foam. Air can circulate through the mattress to prevent your baby from overheating, who are not able to regulate their body temperature as effectively as adults. Additionally, a breathable mattress helps to prevent the buildup of moisture, which can cause odors and other issues. 【FITS STANDARD FULL-SIZE CRIB & TODDLER BED】：7-year warranty; Size: 27.5"W x 52"L x 4.5"H (fits standard cribs and toddler beds); This crib mattress is designed to be suitable for both infants and toddlers