FlaskarsProtective Silicone Boot for 12oz - 40 oz Hydroflask Water Bottles Anti-Slip Bottom Stanley Sleeve Cover Bumper (Black, Fits Hydroflask 32 and 40 OZ)

Fit my Hydro flask perfectly and protect the bottom. Comes off easily to wash. Highly recommend.

Great fit and protection. Reasonably priced

This was the best purchase to compliment my water flasks. It's really good material and keeps my metal flasks from banging on every surface and keeps them from slipping around. It's easy to put on and take off and washes up in seconds.

Perfect fit for my Hydroflask

Definitely a hydroflask silencer! Love this, great material that I haven’t notice catch any lint or anything

We bought this for our kid who uses several sizes for sports and school. She was careless with setting these down or even swinging them against our counter tops and so forth. We bought them and they fit great and she can set them down without banging anything. However, note having these on makes them difficult to slide into the side pouches of book bags and soccer/sport bags. It will go in but you have to really twist them in to fit. They won't slide in -- just small warning.

I ordered the black boot for my Hydro Flask 40oz, and it wasn’t hard to put on. It stays on securely and seems well-made and durable. I needed this since I take it everywhere and don’t want to damage the bottom or scratch furniture. Not bad for the cost.

I purchased these to give my cups a little more protection from dents. Especially because I've had them for years and wanted them to last a little longer. They fit great, slipped on very easily and stay on. I would recommend for quality and fit.