a sled for sliding on a sliding surface includes a hull having a bow end and a stern end defining a longitudinal axis therebetween , a bottom portion having a bottom surface for contacting the sliding surface , and a side portion . a ledge integral with the hull extends in a direction parallel to the longitudinal axis and forms a discontinuity separating the bottom portion and the side portion . by leaning sideways , a rider can cause the ledge to contact the snow , thereby turning or braking the sled .