maxSHELL® technology / QUICKSAFE® size adjustment system with dual LED rear light / Insect net / 8 Vents / certificated EN 1078 Sizes (cm): 44-49 (XS), 46-51 (S), 49-55 (SM) , 52-58 (M) / Weight (g): 220 (XS), 250 (S), 270 (SM) , 280 (M)