Oneday Borosilicate Glass Water Bottle with Colors Nylone Potholder Sleeves&Steel Lids Eco-friendly & BPA-free Camping Outdoor Non-leak Water Glass Bottle (12 Ounces with Tea Infuser/Blue Sleeves) UNIQUE and FASHIONAL design: This bottle was designed on both esthetics and comfort. There is a loop on the sleeve, which makes the bottle convenient to carry, perfect for travel and sports. Environmental and High-quality Material: The bottle 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, high 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. Useful Nylon Sleeve: The NYLON COVER provides a comfortable feeling and against hot. It makes easier to grip against falling off and effective protect glass body from damage, and fits most standard car cup holders. Easy to wash: The glass is super smooth, which is very easy to wash just by clear water. Hand wash is recommended; lid could be cleaned by dishwasher. NON-LEAKING: we have done multiple testing for this design, never leak after test 100pcs random sampling. If you get the bottle and find it leak, please check the gasket if it is at correct place, see left last picture to compare.