The SK-5 is largely based on the GP-5 model, but is specially developed for kart use, with a slightly larger opening aperture as needed in the fierce kart competition. ClC (Complex Laminate Construction) outer shell with a 3 mm thick, 2D visor with F1 aluminium visor system prepared for the use of tear-offs. 4-point upper ventilation system, with large closeable twin intake scoops en closable Double-Delta2 bridged exhaust vent. Comfortable, washable lining material for better ventilation at karting speeds. The open face GP-JET2 has an cLc (Complex Laminate Construction) outer shell with the new adjustable ‘'Hyper-T'' peak with removable light tint anti-glare lens. Extra ridge at the bottom of the shell for more stiffness, removable cheeckpads for an even more custom fit.