The 2019 Definition 5mm steamer offers more stretch, more comfort and more features. The suit 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. An Ultraspan chest panel and Stretchtec fabric on the body, sides, arms and legs work together to produce a highly flexible and snug fit, providing extra stretch where it's needed most.