The Adept series of Armaggeddon mousemats, feature a hybrid surface that is suitable for most games and also has been highly recommended by designers. The improved tracking due to the textured surface, accompanied by a relatively smooth glide, provides an excellent environment for gaming-grade mice to thrive on. Having a mousemat not only aids performance due to absorption of shocks from friction and bumps, but it also can improve comfort and discourage habits which result in RSIs (Repetitive Strain Injuries). All Adept mousemats come with a combination these 2 features: Pile refers to the thickness and density of the mousemats. Density is determined by the intended usage, balancing between firmness and shock absorbency. Parameter refers to the size of the mousemat, indicated by diagonal distance from corner to corner. Pile Parametre Heavy (5mm) 23″ (455x355mm) Please Note: ***Picture is 17″ Model