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The construction of twin tip skis
Freestyle skis are actually also called twin tip skis because both the tips and tails have upwards curves. The curved-up tips and tails prevent resistance and make it easier to do tricks in the parks and on the slopes. Furthermore, it is possible to make backward landings with a pair of twin tip skis, just as you are able to ski backward. That is why you might also call them trick skis at times. The twin tip design has more or less become the standard design of most park skis because it's a great design for the slightly deeper snow.
Twin tip skis often have a soft flex - both on the long side of the ski and torsional - making them resilient and flexible. Generally, this type of ski also has a wide tip, tail, and middle / waist, and the construction consists of soft materials for better shock absorption. Twin tip skis usually have a rockered tip and tail combined with a camber or flat middle.
Freestyle skis are park skis
Freestyle skis are often called park skis as well because they are suited for different freestyle disciplines, just like snowboards. Different freestyle disciplines have been part of the skiing scene for many years, but in the 1990s some skiers started to do tricks in parks made for snowboarding. The skiers needed a new type of skis for the new discipline, and soon several manufacturers started to produce skis with twin tip design.