The new Definition Top looks good and delivers a boost of warmth in the core torso area where you need it most. It is made with quality 1mm X-Foam neoprene with an outside super-stretch nylon lining and an inside mix of plush on the front and back of the torso and super-stretch nylon on all other panels. Thumb loops plus an additional loop at the hem prevent ride-up when wearing beneath a wetsuit. Ideal for pool training or as a base layer beneath a wetsuit or a semi-dry when diving or snorkeling.