Made of 95% polyester, 5% spandex, light and breathable! Forget about rashes and undesirable skin infections! Sized for a standard sized crib or infant mattress 52”x 28”. Reinforced elastic lining for easy stretch and smooth fit! Pre-washed using phosphate-free detergent. Machine wash cold, delicate cycle. Tumble dry low. We strive for the best product and service! 100% lifetime support from SHUCHE, any questions, welcome to get back and we will get back immediately! Made of 95% polyester, 5% spandex, light and breathable! Forget about rashes and undesirable skin infections!