A ski suit is a suit made to be worn over the rest of the clothes when skiing. A ski suit made for more casual winter wear outdoors may also be called a snowsuit.

A ski suit can either be one-piece, in the form of a jumpsuit, or two-piece, in the form of a ski jacket and matching trousers, called salopettes (or ski pants).

A ski suit is made from wind- and water-resistant or water-proof fabric, and has a non-removable liner made of nylon, silk, cotton or taffeta. Its main function is to keep a person warm while participating in winter sports, especially Nordic (cross-country) or Alpine (down-hill) skiing. It is generally a unisex garment.

A ski suit is usually made to keep the body warm (sometimes partly due to a suitable silvery colour that as a result increases its thermal conductivity^{[citation needed]}), but the user often wears warm underwear too. It can also be used for alpine racing to improve aerodynamics. Ski suits made for speed skiing and alpine skiing might be very thin and skintight, adding as little air resistance as possible to the body.

A ski is narrow strip of wood, plastic, metal or combination thereof worn underfoot to glide over snow. Substantially longer than wide and characteristically employed in pairs, skis are attached to boots with bindings, either with a free, lockable, or permanently secured heel.

Originally intended as an aid to travel over snow they are now mainly used recreationally in the sport of skiing.

Skis are also fitted to vehicles dedidcated to traveling over snow such as snowmobiles and snowcats.

The Nordic ski technology was adapted during the early twentieth century to enable skiers to turn at higher speeds. New ski and binding designs, coupled with the introduction of ski lifts and snowcats to carry skiers up mountains, enabled the development of alpine skis. Meanwhile advances in technology in the Nordic camp allowed for the development of special skis for skating and ski jumping.

Ski nomenclature is relatively simple. Examining the ski from front to back along the direction of travel, the front of the ski (typically pointed or rounded) is the "tip", the middle is the "waist" and the rear (typically flat) is the "tail".

Suit or suits may refer to: