· 👍 【SMALL BOOT】- Size: 2.83 x 1.9 inches (D x H); Compatible with 12oz 18oz 24oz H’ydr0flask, 18oz 24oz Therm0’flask, 14 18 22oz IR0N’FLASK, 13oz Contig0, 20oz R’ITC, 12oz 18oz 24oz V’mini, Stan’ley Adventure Quen-cher 20oz 30oz 40oz and Stan’ley IceFl0w 20oz 30oz Tumbler, S’imple M0dern 30oz 40oz Tumbler. Fit for most vacuum bottles with 2.9'' bottom diameter. NOT COMPATIBLE: H’ydr0flask trail series 12-24oz.· 👍 【MEDIUM BOOT】- Size: 3.56 x 1.9 inches (D x H); Compatible with 32oz 40oz H’ydr0flask, 32oz 40oz Therm0’flask, 32oz 40oz HYDR0’CELL, 32oz Ir0n’Flask, 32oz V’mini Wide Mouth Bottles, etc. Fit for most 32 40 oz wide mouth vacuum bottles with 3.6'' bottom diameter. PLEASE NOTE: Medium Boot is not compatible with 20-40oz Stan’ley tumbler. Please measure the bottom diameter of your bottle before buying our bottom cover protector.· 👍 【BPA FREE】- BPA-FREE silicone, safe for all ages. Made of super soft and stretchy silicone material, our water bottle boot can be taken off and washed after using for a period of time. Durable, reusable, guaranteed to NEVER come loose! Easy to take it on and off. Perfect for all sports and outdoor activities. Ideal for work, picnic, hiking, camping, yoga and so on.· 👍 【WELL PROTECT】- Our silicone bottle bottom boot snugly fits bottle bottom and is not easy to slip off. Help to protect your beautiful bottles against dings, dents, scratching and damage. Also keeps the noise down, quieter when setting down the bottle on table surface. Provide a longer life for your metal water bottle.· 👍 【100% SATISFACTION GUARANTEED】- We are committed to providing customers with quality service! You are assured to get the products as described and get the quick/ easy customer service by talking to us directly.