In addition to the expected insulation sleeve over the exposed portion of tubing, a roomy insulated "pocket" for the bite valve provides considerable protection. The attached webbing with clip (for sternum strap) provides a clever way to open and close the bite valve pocket and easily access bite valve with one hand, all without taking gloves off!

As someone who spends a lot of time backcountry skiing, I have experienced every single problem with my bladder, bite valve and straw, from freezing to leaking and everything in between. This sleeve has changed my life. Somehow the water doesn't freeze in the straw or bite valve when it's in this sleeve. Plus, they thought of every little touch to make it easier to use, like when you want to zip the straw back in, there's a little tab that is easy to grab with gloves on. This winter insulator is a game changer for me and I couldn't recommend it more.

I've not used this yet but am expecting it to join my on my winter trail hikes/runs.

I like the option of an insulated sleeve. In the past, I've been a bit annoyed when my first drink drink of water is warm.

I like that you can zip it over the mouthpiece, and installing it was very easy.

This is really cool! As someone who lives in a cold climate, I had no idea something like this existed!

I have previously used insulated camelback reservoirs (with neoprene insulation sleeves on the drinking tube, and I much prefer this option. 1. This fully encloses the tube including the bite valve (and doubles as a cover to keep the bite valve out of the dirt) 2. Along with the quick release hookup for the Mazama intake 2L reservoir, this sleeve is remarkably easy to install quickly.

I haven't used this yet, but I'm excited to use it this winter when I go skiing. Last year, my water tube froze and I had no water in the afternoon.

I don't do much cold weather hiking, but the insulator also helps keep the first so from being warm not to mention can help cut down on algae and other build up.

I love this insulator. Cant wait to try it out in the winter.