This boot comes in a 170 flex and a 93mm last. The DRS World Cup boot is for top level performers, Olympic, professional and hard charging athletes. The DRS models satisfy the unique equipment demands of skiers looking for an alternative traditional 4 buckle “race” boot. Skiers requiring a performance update with a ski boot that offers a naturally balanced stance rather than one locked into an unnaturally inclined forward position. Skiers seeking power, control, edge to edge quickness, less distortion, less chatter, more efficiency, and unmatched out-of-the-box fitting comfort.