For indoor football, indoor boots are used. These come with rubber soles, meant to maximize grip on the floor. Some are built on the design of firm-ground football boots, and some are specifically designed for the indoor game. For football on turf or artificial grass, some players wear regular firm ground football boots. But wearing regular football boots on turf greatly reduces the life of the boot, so companies such as Nike have developed football boots for artificial grass (AG), which have smaller circular studs.