Made from 100% platinum European-grade silicone, this straw lid stretches over a WIDE variety of cups and glasses. When the silicone lid is pulled over a cup, the suction keeps the lid in place making your new straw cup virtually spill-proof. Reduce your plastic footprint by using this at a restaurant or your favorite coffee shop, keep the bugs out of your drink while sitting at the campfire, use it poolside or on the boat – the list goes on and on. The included reusable silicone straw won’t melt in your drink like a paper straw or hurt your teeth like a stainless-steel straw. GoSili reusable straws are translucent, so you can easily make sure they are clean.