Twin-tip skis are a ski design which began to gain popularity in the late 1990s. Conventional alpine skis have a curved front end and a flat rear end. Twin-tip skis have curved fronts and rears, which enable the skier to do more tricks, turn more effectively, have stable landings, and ski backwards as well. The versatile skis led to a resurgence in popularity for skiing amongst younger sportspeople, and led to changes in ski resort design as well.

Twin-tip skis were developed by Clint Fiala, who constructed twin-tip skis in his garage before realizing the commercial potential of the skis. The design was picked up by Salomon, a venerable ski company, as the Teneighty. Today there are a wide range of twin-tip skis on the market, although Teneighties are linked with high quality. Sales of twin-tip skis are rising while skiing grows in popularity as a winter sport.

In addition to being upturned at the front and the back, twin-tip skis also have a distinctive hourglass design, narrowing slightly in the middle. Twin-tip skis can come in designs which are very wide for increased stability on a variety of terrain, or they can be narrow for speed. Either way, twin-tip skis are highly adaptive, allowing skiers to turn on a dime, spin in halfpipes, and do a variety of other skiing stunts.

Twin-tip skis are often linked with snowboards, because both enable athletes to do an astounding array of tricks. Many snowboarders have taken up twin-tip skis as well because it is actually possible to do more tricks on skis, due to the greater amount of speed which can be achieved. As a result, skiers and snowboarders are often seen sharing space in halfpipes and other areas at ski resorts set aside for tricks.

Due to the increased demand caused by twin-tip skis, ski resorts have begun changing the way they groom their facilities. More space is set aside for stunt areas, halfpipes are much larger, and youthful skiers are welcome at many resorts. Several stunt skiers who use twin-tip skis are sponsored by resorts, and make excellent advertising for their facilities. Twin-tip skiers and snowboarders tend to have very high standards about snow quality and pack as well, which has driven up overall standards at many ski resorts.

Some traditional skiers are uncomfortable with the rise of twin-tip skis. Twin-tip skiing is markedly different than progressing in a stately and elegant fashion down the slopes. It is a rugged, active version of skiing which can potentially be far more dangerous, as well as providing a rewarding adrenalin rush. At resorts where adequate provisions have not been made for twin-tip skiers, this has led to conflict on the slopes.