The skis used in cross-country skiing are light and narrower than those used in Alpine skiing. The skis used in cross country skiing are freestyle skis and classic skis that have different requirements. Freestyle skis are generally 1.7-2 m long and 4.5-5 cm wide while classic skis are longer than the freestyle ones having a length of 1.95-2.3m. Gliding wax is used on the undersurface of the skis to reduce friction.