This is the Aqua Lung Echozip 5mm Kids/YOUTH Boot Scuba Diving Booties Features: Warm Upper is made of 5mm neoprene for added warmth. Flexible The tough yet flexible vulcanized rubber sole will move naturally with your child&';s foot while wearing open-heeled fins. Protective Protects against puncture hazards on deck and on shore. Protect young feet from hazards both natural and human-made with a sturdy zip boot. The soft neoprene upper adds warmth, and the rugged yet flexible sole provides traction and a barrier against sharps, stings, and scratches. The sturdy, locking zipper is made of non-corrosive material.