MEDIUM REEF PINK BOTTLE BOOT: This colorful, durable silicone Bottle Boot protects against bumps and dings. Specifically sized to fit Hydro Flask 32 oz and 40 oz Wide Mouth bottles. 32 OZ & 40 OZ BOTTLE BOOT: Bottle protection for Hydro Flask 32 oz and 40 oz water bottles. *For Travel Series sizes, please see Hydro Flask Tumbler Boots. SOFT SILICONE: Removable silicone boot adds extra protection to your water bottle. DISHWASHER SAFE: Easy to clean, Hydro Flask bottle boots stay clean and colorful. Not for use on a stove, in a microwave or freezer.