The Fox Racing Launch D3O Elbow Pad is impact protection for mountain biking. Cover the elbows and ride like the wind, while staying on the bike is preferable; if a tumble happens, the 'bows will be shielded from bumps, bruises, and scrapes. Protecting the body means more riding, and the slip-on style stays put with the hook and loop adjuster. This product comes as a pair, so you're covered on each arm.