I have been using these for years on the bike. You can imagine it gets pretty hot here in central Texas during the summer months. We've got a fridge out in the garage, and we just grab them and on the bike they go. They are a little bit thicker than a regular cycling water bottle, and weigh a little more. But in my experience I would say they keep liquids cooler about twice as long. You can find most colors at your local bike shop. This past year they've come out in different colors...and they have 2 sizes. Look to pay about $12-13 for the big size.