The term BIATHLON WEAR is a combination of two words, 'biathlon' and 'WEAR'. Biathlon is a winter sport that combines cross-country skiing and rifle shooting. The clothing worn for biathlon is designed to keep the athlete warm and dry while they are competing in the cold weather. SKI is a three letter word that is used to describe the type of clothing worn for biathlon, which includes SKI pants, jackets, gloves, and hats.