MEGAComfort's Personal Anti-Fatigue Mat (PAM) ESD insole is ergonomically designed by a Podiatrist, using a patented combination of high density dual layer 100% memory foam for anti-static footwear only ESD threads provide tested electro-static dissipation Using PAM ESD does NOT make regular footwear ESD compliant Clinically proven and field tested to reduce pain and fatigue while increasing balance and comfort Provides maximum shock absorption and comfort in anti-static footwear, making them far more effective than the expensive ESD matting Ideal for stationary and mobile workers For use with Anti-Static Footwear only Soft contoured arch support provides balance, comfort, and cushioning Silver ion anti-microbial technology in top cloth offering anti-bacterial, anti- perspiration, and anti-odor protection Arch Type Low/Medium/High Toe Shape Round