What are the TPE Gel Insoles? Providing a superior fit for complete comfort, the TPE gel insoles feature a polymer gel construction for maximum shock absorption. How do the TPE Gel Insoles work? The TPE gel insoles have been created with revolutionary polymer gel, which traps shock waves at the source, so you can be sure to enjoy walking or hiking in total comfort. These durable gel insoles feature a contoured design to ensure a superb fit. What sizes are available? The TPE gel insoles come in mens & womens sizes, & can be trimmed to fit.