Rated 2 out of 5 by Kisa not very useful
At a certain temperature no amount of neoprene will keep your water from freezing in the tube. The only useful thing about this system is that the black color helps absorb sunlight which might hasten the melting of the ice (but it doesn't prevent it from freezing in the first place). Instead of relying on this tube cover (like I did), just blow the water back into your resevoir after every sip. Don't leave your water sitting in the tube and it will not freeze in the first place. I learned this the hard way!
August 8, 2012