The Spinlock Alto USCG 75N Flotation Aid is designed for a variety of watersports and is approved by both the USCG and Transport Canada. It is a compact and lightweight inflatable buoyancy aid belt that can be worn around the waist and easily adjusted for a secure fit. The 16g CO2 cylinder must be manually activated and provides a 50N buoyancy aid. For added safety, the Lume-On™ Bladder Illumination Light and a whistle can be added. The waist size range is from 70-145cm (27.5" - 57"), and the product weight is just 376g (13.3oz). This product uses the DW-RAK/75 re-arming kit, which includes 2 x clips and 2 x 16g cylinders.