Depending on the type of surface, kind of sport and even the wearer's position or role in the game, different styles of boot and particularly stud configurations are available. For hard pitches, amateur participants may wear a sneaker shoe or a plastic-stud boot (known as a "moulded sole" or "firm ground" boot); in most sports and positions this is adequate, although on a well-grassed or sodden field, screw-in studs are recommended for more grip; these may be metal, rubber or plastic and are called "soft ground" boots. When playing on this kind of pitch, some players favor using a boot with screw-in studs in their non-dominant (supporting) foot to provide grip, and a boot with short rubber or plastic studs in the dominant (kicking/passing) foot to provide accuracy. However, most players opt for a consistent configuration on both boots.