【Wide Compatibility】HEYSKAY protective silicone boot was designed for 40oz stainless steel Owala Twist,FreeSip or Flip water bottles. It also fits other brand water bottle which bottom diameter is from 3.46inch to 3.65inch. NOT intended for Owala tritan plastic water bottles 【New Looking Creation】We have different colors and print designs for selection, try mutiple colors/designs, mix and match to create a new looking for your water bottle, more stylish & special and be you 【Food Grade Material】Our bottom base is made of food grade silicone material, BPA-Free, odor-free, safe for your daily use. And it is thick enough to protect your Owala water bottles from damage, dings, and scratch and prevent annoying noise when landing your flask 【Easy to Install and Remove】Our silicone boot can withstand stretching and folding, washable and reusable. Designed with a small hole on the bottom for air outlet, supper easy to install our flask boot 【Satifaction 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. HEYSKAY protective silicone boot was designed for 24oz 32oz 40oz stainless steel Owala Twist,FreeSip or Flip water bottles; Also perfect for Owala 40oz tumblers and Stanley Quencher(30/40oz) H2.0 and Stanley lceFlow (20/30 oz) Tumblers. It also fits other brand water bottle which bottom diameter is from 2.85inch to 3.65inch. NOT intended for Owala tritan plastic water bottles