alleviating any pressure from developing within the wing chamber a second wing chamber 160 is provided the wing chamber 160 has a top 161 and a bottom 162 a lip is provided at the bottom the lip 163 has dimensions smaller than the internal diameter of the wing chamber 160 the second wing chamber 160 preferably has a central axis several openings 164 are provided into the chamber 160 from the front side 134 of the shell the openings 164 are water permeable and aid in alleviating any pressure from developing within the wing chamber the central axis of the central chamber 140 the first wing chamber 150 and the second wing chamber 160 respectively are preferably parallel the three chambers form a shell 130 having a rounded front 134 that is aerodynamic and is free of sharp edges the shell is relatively light weight in comparison to its volume the rounded from 134 provides an ideal surface for the placement of advertisements logos and of highly visible materials the back 133 is generally flat and accordingly presents a large surface area to distribute any force to the user such as if a user was to land on their back the.