Owli SwimWarm Swimsuits are made out of neoprene just like professional diving suits. Neoprene in baby and toddler swimsuits has a couple of benefits. Owli SwimWarm is designed to keep babies warm in and out of the water. Babies tend to lose body heat faster compared to adults or even to children. That's why it is made of neoprene fabric. Due to its composite structure, neoprene forms a barrier between skin and fabric. This barrier allows body heat to remain within the swimsuit and slows down the penetration of cold water or air. Once out of the water this SwimWarm will dry faster compared to regular swimsuits. It's designed specifically for babies and toddlers. That's why it's so easy to wear and take off Owli SwimWarm.