7% spandex Made in USA Constructed with THORLON blended with THORWICK COOL fibers for superior softness, resilience, durability and extra moisture-wicking for drier, cooler, 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. Engineered for women??s feet with extra stretch yarn in the ankle, a smaller heel pocket and a comfort toe box for a better fit. Low profile toe seam won??t rub or irritate the feet. Ventilation panel for extra moisture control and breathability. Unique padding specifically engineered for light hiking, clinically shown to reduce blisters, pain, pressures and moisture.