Designed for Owala - Silicone protective sleeves is specially designed for Owala 30oz & 40oz FreeSip Sway Bottles & Tumblers, fit for stainless steel water bottle bottom diameter 2.77"~2.85" with wide Compatibility. Premium Material - Our bottom base is made of food grade and stretchy silicone, BPA free, soft, flexible, odorless, reusable and durable for your daily use. Dishwasher safe. Silicone boot shields your bottle from dings, scuffs, scratch-resistant and non-Slip Base, keeps your Owala water bottle stable on various surfaces. Easy to Install and Remove - Our silicone boot can withstand stretching and folding, prevent annoying noise when landing your flask. Designed with a small hole on the bottom for air outlet, supper easy to install our flask boot. New Color Creation - We carefully selected 2 different colors to match with the Owala FreeSip Sway water bottle series for our users. Try mutiple colors, mix and match to create a new looking for your water bottle, more stylish & special and be you. Our Guarantee - If you have any questions about our silicone cover sets, please contact us via email and our support team will reply to any technical support within 24 hours. Your satisfaction is our top priority. 2PCS Silicone Boot for Owala Water Bottle 30oz & 40oz FreeSip Sway & Tumblers, Non-Slip, Scratch-resistant, Protective Sleeve for Stainless Steel Water Bottle Accessories BPA-Free Bottom Base(BK+CLR)