The Warmest Baby Wetsuit Around Working like a regular wetsuit, the Warm In One works by trapping air between the layers of the wetsuit and helps babies to regulate their body temperature, much like wrapping them up in a warm coat in the winter. This unique wetsuit is lined with a cosy nylon/polyester mix whilst the outer shell is made from Thermoplastic polyurethane, creating a comfortable, yet durable suit that will extend the time your baby can stay in the water and make baby swimming a much more enjoyable experience. A whole range of benefits The unique fleece lining inside the Warm In One provides an array of benefits for your baby. Soft and cosy, the fleece lining will keep baby warm whilst in the pool and even on the chilly walk back to the changing room. Helps to keep barrier creams in place. The cuffs on the full-length sleeves and legs minimise the amount of water getting into the suit and washing creams away. Velcro fastening at the back makes changing easier, even when the suit is wet.