Viscoflex memory foam adjusts to wrist shape for all-day comfort Distributes pressure evenly for reduced fatigue. Half moon wrist pad relieves wrist pressure. Dark color amplifies infrared light for smooth mouse tracking. Soft Lycra(R) cover material is easy to clean. Breathable cover is AEGIS(TM) Microbe Shield treated. Antimicrobial treatment resists mold and fungus, controls mildew and odor, and stays looking newer longer. Nonskid base won't slide. Made by KellyREST.