The GoSili Straw Cup is 100% European grade silicone with an embedded stainless steel ring, so it won't collapse when gripped. This all silicone 12 oz cup includes an all silicone straw top with a straw that inserts for a tight fit. All parts are dishwasher and microwave safe.

Product Details:

• 12 oz
• 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