Salomon uses the terms S/Max, S/Pro and S/Pro HV to differentiate between the lasts (widths) on its narrow (low volume), medium (mid volume) and wide (high) volume boots. S/max boots are the narrowest, with a stated last of 98mm. S/Pro are the medium-width boots with a stated last of 100mm and S/Pro HV are the widest. (102mm). In short, S/Max boots are ideal for skiers with narrower feet, S/Pro boots are best-suited for skiers with medium width feet, and S/Pro HV are for skiers with wider feet. , The difference between the Salomon S Max and the S Pro comes down to width. Someone who has medium to wide, the S Pro model will be more comfortable. While the S Max model is ideal for a skier with narrow feet. , The Salomon S/Series boots are available in a wide range of variants and offer a fantastic solution for skiers looking for a performance boot without sacrificing comfort. The main difference between the S/Max and S/Pro is that the S/Max is more suitable for riders with medium to wide feet, while S/Pro boots are more suitable for riders with narrower feet.