The robust pocket with its splint closing system & the exchangeable belt system can be mounted directly to the harness or at the belt. It is for rough use & perfect for kite, wind & wave surfing, or SUP. The RESTUBE sports also can be used for any other water-related activities. More often professionals are using it for additional personal self-protection out there in the field.. Inflatable swim buoy for surfing, kite surfing, windsurfing, stand up paddle (SUP) & kayaking. The RESTUBE is NOT a Coast Guard approved life vest as it does not go over your head or wrap around you. It will not help you if you are passed out. It acts as a flotation swim buoy to rest on & easy to swim with.