Advanced longboarders may be seen "sliding" (skidding sideways) to slow their boards on really steep hills. Special gloves incorporating a hockey-puck-like friction pad velcroed to the palm may be worn, which assists in both balance and braking, allowing one hand to be dragged on the ground. A lot of longbarders just make their own gloves, from sections of sliced-up cutting board epoxied to the palm and fingers of work gloves. On narrow, terribly steep hills (such as in San Francisco, for example), there's not enough room to carve back and forth to keep one's speed down, and "bombing" (dashing downhill) similarly could result in an accident or uncontrollably high speed, and so sliding was invented by a California surfer. sliding is a difficult and advanced method of slowing a board, though. While learning the slide, full pads and a helmet are a must. During more ordinary city commuting, the easiest (and first) braking skill one learns is simply to drag the toe or heel of one's rear foot on the ground. The trucks (swivelling axles) of a longboard turn far more freely than that of a freestyle board.