Lacrosse is a popular team sport in North America and is Canada's national summer sport. It has grown in popularity in the United States, becoming the fastest growing sport at the high school and NCAA levels. In its current form, men's lacrosse is played on a field of grass or artificial turf (such as FieldTurf). Each team is composed of 10 players on the field at a time: three attackmen, three midfielders, three defenders and one goaltender. In men's lacrosse, players wear protective equipment on their heads, shoulders, arms, and hands, as body-checking is an integral part of the game, and stick checks to the arms and hands are considered legal. Women's lacrosse is played in a similar manner except with two additional midfielders per team. Players of women's lacrosse (in the United States only) need only wear protective eyewear and mouthguards (except for the goaltender, who wears additional padding