Silicone is the perfect material because it is hygienic, hypoallergenic, resistant to bacteria and extremely easy to clean with warm soapy water or in the top rack of the dishwasher. Silicone can withstand both hot and cold temperatures and doesn't warp or damage under prolonged exposure. Silicone is soft and flexible which keeps baby comfortable and rolls up for easy storage Silicone is durable and unbreakable BPA-free. Waterproof & Washable. Easy to Clean. Made in PRC.