The DEFINITION 5MM steamer is built with the Body Map System, a manufacturing method that uses a 3D cut, special tailoring and material inserts to create a suit that fits the body like a glove, provides extra stretch where it’s needed most, and offers a level of warmth, comfort and durability well-suited to active temperate water and warm water divers. It not only excels in keeping you warm, its Ultraspan chest panel and Stretchtec side panels team up to deliver lots of stretch for the ultimate in comfort and range of motion. The infrared fleece interior lining reflects body heat to ratchet up warmth even more, plus it's comfortable as can be against the skin.