Adventure essential.Add a little more protection against bumps and dings with a Bottle Boot exclusively for the Lightweight Trail Series™ collection. Specifically sized to fit Trail Series™ 21 oz and 24 oz bottles.Fits Trail Series™ 21 oz and 24 oz bottles.Removable silicone boot adds extra protection to your Hydro Flask bottle.Perforated for lightweight protection.BPA-FreeDishwasher safeNot for use on a stove in a microwave or freezer.