This all silicone 12oz cup is 100% European grade silicone with an embedded stainless steel ring. It won’t collapse when gripped. The all silicone straw top and straw inserts for a tight fit and all parts are dishwasher and microwave safe. 
 
Silicone cup that holds it's shape, no collapsing mouth 
Silicone top inserts for a tight fit
Can be boiled to sterilize 
100% silicone and 100% stainless steel ​ 
Dishwasher and Microwave safe