Bottoms are an apparel term used to describe the layers of clothing worn on the bottom half of the body. Bottoms may be in reference to undergarments or outerwear.
About Ski Pants:
Ski pants are pants specially designed for protecting the lower body against cold weather when skiing. Ski pants are made in wide a variety designs, are generally made from waterproof and stretchable fabrics and feature insulating materials which have been developed to maximize heat retention.