1. Humanity design, 4 point holder, balance evenly the stress, use shoulder and arm to hold, just like mother's hands hold child's body. Much soft under arm, add the water big buoyancy , not hurt to children.2. More free activity - all feet and hands, chest, back, nearly whole body (except head)can play freely. More sports, excise reactive ability, more intelligent and grow faster. Not limited in only one position to swim - it can swim in stand, lying, breaststroke, backstroke and any other posture freely. The back and chest in water, keep warm than all other float, not get cold, especially in not so hot weather.3. Boat shape, it can be as swim trainer float, more training practice sports. No need take pump to inflate, safety and convenience. Its the best water floatie as children swim training aid.4. Safety - Non-inflatable, never leak, soft swimsuit cloth outside, inside pearl foam with large buoyant. No plastic cool feeling and chemicals smell on market cheap pvc float. Double buckle, durable protection. Not Sinking or turn! Dries quickly!5. Size M For age 3-6 years kids, Size L For age 6-9 years kids, wider range, durable, use long time and repeatedly. BPA free environment material, more safety. Meet Requirement of toy international safety standard. Best gift in classic swim trainer.