Depending on the type of surface, kind of sport and even the wearer's position or role in the game, different cuts of boot and particularly stud arrangements are available. For hard fields, amateur participants may wear a sneaker shoe or a plastic-stud boot (known as a "moulded sole"); in most sports and positions this is adequate, although on a well-grassed or sodden field, a screw stud is recommended for more grip; these may be metal, rubber or plastic. For indoor soccer, indoor cleats are used.These come in many styles, some with studs and some without. They vary greatly from normal soccer cleats.