Abstract: A removable insulating jacket for the body section and funnel section of a bottle carried in a cage affixed to a bar of a bicycle in which the insulation for the body section is formed from foam having skin on at least one surface that is compressed to form flaps that are used to secure that portion to the bar and tabs for closing off the rear end. The insulation for the funnel section is formed from an arcuate sheet of foam that is connected end to end to form a frustum having ridges therein to enable a cyclist to obtain a good grip thereon when the bottle is to be removed from the cage.