Product Details + From the manufacturer Consistent Mouse Movement Thick, High-Density Rubber Foam At 3mm (M&L) and 4mm (XXL&3XL) thick, the mats remain uniformly flat even over imperfect surfaces Quick Fluid Swipes Micro-Weaved Cloth Surface Optimized across all mouse sensors for pixel-precise accuracy and total tracking responsiveness M: For Most Users 360 x 275 x 3 mm (14.17 x 10.83 x 0.12 inches) Studio Setup Shot Medium Studio Setup Shot Large Studio Setup Shot XXL Studio Setup Shot 3XL Approximate Dimensions Size Width Depth Thickness Medium 360 mm / 14.17 in 275 mm / 10.83 in 3 mm / 0.12 in Large 450 mm / 17.72 in 400 mm / 15.73 in 3 mm / 0.12 in XXL 940 mm / 37 in 410 mm / 16.14 in 4 mm / 0.15 in 3XL 1200 mm / 47.24 in 550 mm / 21.65 in 4 mm / 0.15 in