The equipment used in freestyle is usually a soft boot with a twin tipped board for better balance while riding regular or switch, though free ride equipment is often used successfully. The most common binding stance used in freestyle is called duck foot, in which the trailing foot has a negative degree of arc setup while the leading foot is in the positive range i.e. +12?/ 9?. Freestyle riders who specialize in jibbing often use boards that are shorter than usual, with softer flex and filed down edges. Shorter length enables the board to be rotated faster, and a softer flex requires less energy for a rider to press a feature. Reverse camber boards, or better known as rocker boards, are most often used as freestyle boards due to their softer flex and inverted camber design. Pressing refers to a type of jib where the rider leans heavily toward the nose or tail of their board causing the opposite end of their board to lift off of the feature they are sliding on. This trick is typically done for added style. Freestyle also includes halfpipe tricks. A halfpipe (or pipe) is a trench like half tube made of snow. Tricks performed may be rotations such as a 360? (a full turn) in the air, or an off axis spin like a McTwist. Tricks can be modified while hitting different features.