This is the Alpine racing sled with a built-in shock absorber that irons out bumps during rapid, downhill descents. Designed in Germany, the sled's corrosion-resistant, aircraft aluminum alloy frame uses a shrouded 6 1/2" spring--the same used in off-road bicycles--to significantly reduce the effect of bumps on the lower back. The wide runners have polyethylene glide bars that provide superior gliding and tracking, and you can even use ski wax to optimize their performance. Turns are performed by leaning to either side or using one's feet. The polycarbonate seat and footholds place riders 11" above the ground. The handbrake located between the legs consists of an aluminum claw that grips the snow and ice directly beneath the center of mass of the sled without altering the direction of travel, enabling you to slough off speed, but also providing absolute, confident stops. Supports riders up to 220 lbs. The frame collapses to 43" L x 18 1/2" W x 6 1/4" H for storage in the included travel bag. For ages 14 and up. 39 3/4" L x 18 1/2" W x 11" H. (21 lbs.)