✅FUNCTIONAL--Fits Hydro flask 12OZ 16OZ 18OZ 20OZ 24OZ stainless steel wide mouth water bottles and 18OZ 21OZ 24OZ standard mouth Hydro flask water bottle, Hydrojug Traveler 20oz 32oz 40oz tumbler, it also fits Owala 24OZ Twist,FreeSip and Flip Stainless Steel Water Bottle and the other brand water bottles in the same bottom diameter(Size: 2.85inch bottom diameter, 1.89 inch high). Note: this flask sleeve is also ok for Stanley Adventure Quencher 40oz tumbler and Stanley IceFlow 20/30oz Tumblers ✅SMART IDEA--No noise any more when landing your flask on desk and protect your flask bottom from damage. Bright up your Hydro flask and get a new looking for your favorite flask! ✅BPA FREE--Made of high quality food grade silicone material, feel safe to take it as a dog bowl on-the-go activities ✅PORTABLE TO CARRY--Reusable, washable and foldable. Our sleeve can withstand stretching, folding, and anything life throws at it 😊SATISFACTION GUARANTEED--Buy with confidence! You are assured to get the products as described and get the quick/easy customer service by wiring or talking to us directly About HEYSKAY flask silicone boot-BPA free soft silicone material-Fits Hydro flask perfectly and the other brands which diameter is the 2.85in as Hydro flask like as Simple, Mira, Yeti Bright up your Hydro flask look-No noise any more when landing your flask on desk and protect your flask bottom from damage, smart idea!