GREAT TRAINING TOOL:Help develop upper body strength by suspending and floating your legs and correcting your swim posture. PRINCIPLE:By immobilizing the legs and mentally focusing on proper hip rotation generated by the core. EASY TO USE:Simply place the pull buoy in between your thighs to secure use a pulling leg strap to secure your feet together if you have trouble keeping the buoy in place. VERSATILE:Pull buoy is a product designed with portability, ergonomics and easy storage in mind. HIGH QUALITY:EVA foam material, skin-friendly Soft Strong and durable, Does not chafe or irritate skin. Colour: Material:EVA Size: about 23 x 12.5 x 8cm Package Contents: 1 * Swimming Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.