The ISLE Inflatable Life Jacket is custom designed for comfort and ease of use. Adjustable for a wide range of users, the low-profile belt sits on your waist and is ready to deploy if ever needed, while remaining discrete and out of the way when not in use. Includes a replaceable 16g CO2 cartridge (any universal threaded cartridge) that inflates the floatation aid in seconds. An outer zipper pocket includes a whistle for signaling in the event of a mishap.