MAXIMUM PROTECTION : Durable Diamond Texture Silicone Flex Boot extend the life of your bottle, against unexpected scratches, dents or dings outdoor and indoor FITS PERFECTLY : Sizes available, 12-24oz perfectly Compatible with 12 16 18 20 21 24 oz flask & Stanle 40oz 30oz 20oz and with same bottom width 2.85"-3" of bottle TOP QUALITY : Premium food grade silicone rubber, more stretchy and durable,without BPA, Safe for all ages. Easy to clean. Easy to put on and take off bottom sleeve of water bottle CUSTOMIZE YOUR BOTTLE PROTECTION : WUQID uniquely designs diamond texture various color bottom boot, diamond texture not only lets your bottle show your temperament more but also provides your bottle better slip-resistant and cushioning effect 100% LIFETIME SERVICE FROM WUQID : Note: Please measure the width of the bottom of the bottle before purchase (To avoid size purchase error).Any quality issues we will try our best to give you a satisfactory solution. Try them out for yourself completely without risk boot