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. Women's specific design includes extra stretch yarn in the ankle and arch, a smaller heel pocket and a smaller custom toe box for a superior fit Thorlos clinically-tested padding under the ball and heel provides maximum protection from friction, the primary cause of blisters, and impact protection where needed most Constructed with THOR•LON fibers for superior softness, resilience, durability and moisture-wicking for drier, better feeling feet Cushioned instep and arch for a better fit, more support and less pressure on the feet for a more comfortable day hike Low profile toe seam won’t rub or irritate the feet Ventilation panel for extra moisture control and breathability