To maintain freedom of movement and shred longer in winter's frigid swells, we tug on the Roxy 4/3mm Swell Series Chest-Zip GBS Wetsuit. Constructed with ultra-stretchy neoprene and flexible seams, this suit helps keep us warm without holding us back, while the soft fleecy lining at the chest and back helps us retain core warmth to keep our muscles primed for when our wave comes rolling in.