Ski-Doo Pilot DS REV-XP, REV-XR, REV-XU, REV-XS, REV-XM, REV Designed specifically for mountain riding. Vertical outer edge dramatically improves sidehilling bite. Narrower and thinner, yet stiffer for dependable steering and carving. Boot grips more effective than ever. Carbides sold separately. Skis sold individually. Note: The use of aggressive skis, ski carbide runners or studs will alter the handling of your snowmobile, particularly in terms of maneuverability, acceleration and braking. Please refer to your Operators Guide for more details.