Pur - Flip Straw Cup Straw�cup is designed to help baby to switch�from using starting cup to straw cup. It helps to�develop baby skill from sipping to use a straw.�The soft�silicone straw�made from medical grade material and has non spill valve to protect leak. Made from BPA Free Material Easy grip bottle shape Air Valve to ensure smooth drinking and prevent vacuum Easy�flip flap lid�to keep straw hygiene