Avoid disappointment when training in very low temperatures. Place your Flow bottle in an insulating cover and make sure that the drink you need stays at the right temperature. Thanks to the insulating cover, which is made of neoprene, your drink stays at the right temperature for up to 33% longer, or about 3 hours. The insulating cover is suitable for the Flow bottles that come with the purchase of Flow belts. You can also buy Flow bottles separately.