Hydro Flask Small Bottle Boot Black. Specifically sized to fit our 12-24 oz Wide and Standard Mouth bottles. Specifications for Hydro Flask Small Flask Bottle Boot: Manufacturer: Hydro Flask Color: Black Size: Small Gender: Unisex Age Group: Adults Last Chance: Yes Features of Hydro Flask Small Flask Bottle Boot Fits 12-24 oz Wide and Standard Mouth bottles Removable silicone boot adds extra protection to your Hydro Flask bottle. BPA-Free Dishwasher safe Not for use on a stove in a microwave or freezer Package Contents: Hydro Flask Small Flask Bottle Boot Hydro Flask BBS001: Small Bottle Boot Black