The Hydrastation open water swimmer buoy, in addition to great visibility and buoyancy, allows the swimmer to access the interior of the compartment where water, gels or sticks can be stored as well as other personal items. Thanks to the exterior access of the The central compartment is one of the favorite buoys of long distance swimmers because it is possible to access gels, water and/or bars at any time for proper hydration of the swimmer's body. The oval design of Hydrastation contributes to this open water buoy great stability. In no case does the buoy replace a life jacket.