Yamamoto SCS* Nano finish is the most hydrodynamic wetsuit coating available, reducing drag of clothing and skin by 97% (SCS* Nano CoF is .026 compared to traditional neoprene CoF of 4.0); 3mm SCS* GLIDEflex grooved chest/waist panels increase lung expansion, shoulder rotation, and extension; 3mm SCS* GLIDEflex grooved thigh and calf panels ensure advanced mobility and easy on/off for fast transitions; Smooth, non-absorbent polyester provides a lightweight, comfortable, and extremely flexible next-to-skin lining; Tapered re-designed collar lined with SCS smoothskin features a new lower front to eliminate neck constriction and minimize chafing; Updated cuff construction seals out water and makes for easy on and off; 5mm torso/thighs; 1.5mm sleeves, underarms, and cuffs; 3mm and 4mm in the lower legs