The thermal body, made from 0.5mm neoprene, provides the warmth of a 2-3mm wetsuit, largely due to its hi-tech four layer construction and lining. The sleeves and collar are made from chlorine resistant polyester to provide extra mobility and comfort. Both the sleeve and body materials carry a UPF 50+ rating and are highly durable in the chlorine and at the beach. The front zip makes the jacket easy to put on and eliminate the hassle of pulling garments over the head.