Ski jumping is a sport in which skiers go down a take-off ramp, jump, and attempt to fly as far as possible. Judges award points for technique (often referred to as style points). The skis used for ski jumping are wide and long (260 to 275 centimetres (102 to 108 in)). Ski jumping is predominantly a winter sport, performed on snow, and is part of the Winter Olympic Games, but can also be performed in summer on artificial surfaces – porcelain or frost rail track on the inrun, plastic on the landing hill. Ski jumping belongs to the Nordic type of competitive skiing.