Getting a pure night of sleep is important for all babies. Made from 100% certified cotton this cover is hypoallergenic and soft to the touch. This 100% breathable cover is made from our pure-air breathable technology, which helps regulate temperature by promoting airflow throughout the entire cover. All of our mattress covers feature an easy zip-off design and are machine-washable for easy cleaning. This fitted sheet fits standard-size 6-inch crib mattresses. This breathable mattress cover helps your baby regulate temperature by allowing air to pass through the sheet for a “breathable” night of sleep. This cover is hypoallergenic, wet-resistant, and maximizes airflow for babies.