Just wasted half an hour trying to work out Acerbis Sizing .. On their own website it shows S/M L/XL and XXL - in the size guide if just quotes one different number for each of these . So no use. The websites who re-sell them have size guides for M/L and L/XL .. so that's no use. Therefore .. Sorry Acerbis .. not buying your stuff if you can't be arsed to make it possible for people to buy the right size.