Football is meant to be played on grass, and it is probably also the preferred surface for most footballers. Therefore, it is of course a necessity to have the right boots when playing on grass. Football Boots for natural grass pitches are typically equipped with a FG-sole, which stands for "Firm Ground" - ie a firm surface.
The studs are made of moulded plastic and have a length that ensures that they grip the ground to give you the best traction when you need to push off and turn. When matches can be decided by centimeter, every little helps, and that's when your choice of boots is crucial. When using a pair of FG soccer shoes on the intended surface, grass, you've at least given yourself the best chance for success at the decisive moment.