"Just like Mom” This all silicone cup is 100% European grade silicone with an embedded stainless steel ring to hold it's shape. No collapsing when gripped. The to-go top also inserts for a tight fit. GoSili's patented technology paves the way for a new drinking experience and is the perfect alternative to plastic to-go cups. Dishwasher and microwave safe. Easy to use, easy to clean, easy to GoSili.