Riding with a passenger should only be done on a snowmobile equipped with a passenger seat and hand grips. These features ensure the safety of both the driver and passenger and indicate the snowmobile has been properly adjusted to handle the extra weight and placement of the rider. A snowmobile is weight-sensitive and when a rider joins the driver the sled must be adjusted so it maintains adequate ski pressure for safe steering. The Operator's Guide for a sled equipped with a passenger seat will show you the proper adjustments to safely carry a passenger. Some Ski-Doo snowmobiles are sold with a single rider seat but can easily accommodate the installation of an accessory passenger seat, while other Ski-Doo snowmobiles come standard with a two-person seating arrangement. One accessory that makes riding 2-up even more fun for a passenger are the heated hand grips with wind deflectors.