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. Condition.NEW Warranty.30 Day Warranty Features.Newly produced Hydro Flasks do not feature a registered trademark symbol next to the logo,Durable silicone flex boot helps customize your look and protect against bumps and dings,Small boot fits 12 to 24 oz standard mouth water bottles,Medium boot fits 32 and 40 oz wide mouth bottles; Does not fit Trail Series 32 oz water bottles,BPA-free; Lifetime warranty against manufacturer defects Packaging.Retail.