Estilo Glass Water Bottles 20 Oz, Stainless Steel Cap with Protective Silicone Sleeve Reusable glass bottle with stainless steel cup + a protective silicone sleeve. Environmental and High-quality Material: The bottles is made of ultra clear BOROSILICATE GLASS, which is known as a kind of special ENVIRONMENTAL and HEALTHY glass material. It is a kind of low expansion rate, high temperature resistance, high strength and hardness, high transmittance and high chemical stability. The cap is made of high quality stainless steel, and seals are made of FOOD GRADE SILICONE, safe and environmental. Easy to wash: The glass is super smooth, which is very easy to wash just by clear water. Capacity: 20 oz. Dishwasher safe. Protective silicone can be easily removed and replaced.