Maxx-Tuff is the heavy-duty mat that is rOkaymmended for areas that will get extra impact or abuse, such as a dead-lift zone in a gym where heavy weights will be dropped multiple times throughout the day. Material: SBR and Reclaimed Rubber. Mat Sizes: 4ft. x 6ft., 80 lbs. 3ft. x 4ft., 40 lbs. 2ft. x 3ft., 20 lbs. Thickness: