Wrist Rest features 3M Precise Optical Mousing Surface for better performance and gel comfort to encourage neutral wrist posture. Wrist rest features soft leatherette covering. Antimicrobial additive inhibits the growth of microorganisms, such as bacteria, that can cause stains, odors, and product degradation. Large-size Wrist Rest has a nonskid base. 3M Precise Optical Mousing Surface is designed to optimize light reflectivity and contrast to improve the tracking of your optical mouse, extending battery life up to 75 percent. The valleys in the microtexture of the Precise optical mousing surface catch dirt while your mouse glides on top of the peaks for improved high speed traction.