Flooring for Gym Equipment The Heavy Duty RF546 Rubber Mat (.5"x4'x6') has a textured, flat surface finish for excellent grip on both sides. These mats offer super heavy-duty solid rubber construction that absorbs the impact of free weights, exercise gyms and treadmills. The Standard Cardio RF34B Mat (.125"x3'x4') is perfect for bikes and other small footprint exercise machines and can also be used as a general aerobics mat. Super tough, durable PVC material helps protect your floors and carpets while prolonging the life of your equipment. Also available is the Long RF36T Mat (.125"x3'x6.5') for treadmills, ellipticals, bikes, etc.