GoSili cups are 100% European grade silicone with an embedded stainless steel ring to hold shape, ensuring it won't collapse when gripped. 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. Holds 24 oz. Fits in most car cup holders for on-the-go convenience.