The Med Bottle Boot features:

• Fits 32 oz and 40 oz Wide Mouth bottles
• Medium boot is not compatible with 32 oz or 40 oz Lightweight Wide Mouth Trail Series 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.