The ResMed Zippered Tubing Wrap is a lightweight, washable, nylon cover for your standard CPAP tubing. This easy to use and convenient tubing cover insulates your 6-7 foot CPAP tubing to help prevent the occurrence of 'rain out' when using a heated humidifier with your CPAP machine.'Rain out' occurs when water gathers in your CPAP tubing, causing a gurgling sound, due to the condensation caused by humidified air hitting colder temperatures within the tubing. This product is great for individuals who keep a colder bedroom (a common cause of 'rain out') or for anyone who finds water in their tubing or CPAP mask during the night.Convenient design includes a zipper for the entire length of the wrap, making installation or removal from your CPAP tubing a breeze. Lightweight nylon material keeps tubing from feeling heavy or dragging across bed covers. A great addition to any CPAP setup!