Giant Slalom is one of six Alpine Skiing events at the Winter Paralympics, along with Downhill, Super G, Slalom, Super Combined, and Snowboard Cross. Athletes compete against peers with similar disabilities in one of three classifications: standing, sitting, and visually impaired.
Sitting skiers may have a high level of spinal cord injury, thoracic spinal cord injury, or paraplegia, or be double above-the-knee amputees. They speed down the mountain strapped into a "sit-ski" or "mono-ski," which consists of a metal seat and suspension system atop a single ski.
According to the description on the site of the 2010 Vancouver Winter Paralympics, "Giant slalom is similar to the slalom, with fewer, but wider and smoother turns. Each skier makes two runs down two different courses on the same slope. Both runs take place on the same day, usually with the first run held in the morning and the second run in the afternoon. The times are added together, and the fastest total time determines the winner."
You can read more about Alpine Skiing on the site of the International Paralympic Committee.
For more about Giant Slalom and other Paralympic Alpine Skiing events, visit: