Make your Hydro Flask water bottle your own with a colorful, durable BPA-free silicone Hydro Flask Boot. Customize your look and protect against bumps and dings with this flexible water bottle boot. The water bottle accessories are a great way to customize your look while protecting your favorite water bottle from dents and scrapes. The silicone case has a hole in the bottom of the rubber boot to help air pressure when putting it on your water bottle. This Hydro Flask accessories product is backed by a manufacturer's lifetime warranty.