New Page 1 The TYR Aquatic Hand Buoys are ergonomically designed out of EVA foam. Easy-to-hold textured grip for hand placement, secure wrist-lock support on the inside of wrist, hand-lock area above and below grip allows for hand to stay in place without having to grip the buoy. Unique, patent pending design allows for a wide range of exercises and hand placements both above and below the water increasing flexibility, range, and varying your water workouts.