MEGAComfort’s Personal Anti-Fatigue Mat (PAM) Insole is ergonomically designed by a Doctor, using a patented combination of high-density dual layer 100% memory foam. MEGAComfort insoles have been clinically proven and field tested to reduce pain and fatigue while increasing balance and comfort. The PAM Insole provides maximum shock absorption and comfort in industrial footwear, making them far more effective than the standard anti-fatigue floor mats at reducing muscle strain and improving balance reactions. Perfect for steel toe footwear as the memory foam compresses for safe clearance. Ideal for stationary, mobile and those who work outdoors. Sizes: W567, M67/W89, M89/W1011, M1011/W1213, M1213, M1414