Thorlos Original is made with clinically-tested padding that is uniquely designed and applied to provide maximum cushioning under the ball and heel of your foot for maximum impact and friction (anti-blister) protection and any other pressure/friction point created by your sport-specific activity. Thorlos Brand Promise Guarantee - Your feet will feel better or your money back! Made in the USA. Thorlos: Better feet. Better life. Constructed with THOR•WICK COOL fibers for superior moisture-wicking for drier, cooler feet. Cushioned arch for a better fit, more support and more comfort Low profile toe seam won’t rub or irritate feet Padding in the ball and heel absorbs shock and is specifically engineered for protection and comfort while running