Make your Hydro Flask your own with a colorful, durable silicone Flex Boot. Customize your look and protect against bumps and dings. . Removable, silicone boot adds extra protection to your Hydro Flask. . Medium boot fits 32 and 40-oz. wide mouth bottles. . BPA-Free. . Lifetime Warranty. . Standard mouth compatible: Compatible with all Standard Mouth products for ultimate versatility.. . Hand wash. . Imported. . 817318022620 32675700012 BBM