The Shadow is a 0.5mm wetsuit that is great for warm water diving, layering under thicker suits, and other water sports. Shadow is constructed from 0.5 titanium lined neoprene that is great for warm water diving, layering under thicker suits, and other water sports. With its open-cell neoprene interior for warmth, and snag-resistant nylon exterior for durability, protective spine pad, o-ring ankle seals, comfortable neck seal with Velcro+ closure, this is one great and flexible suit.