Hiking Composition: 61.6% Polyester 35.7% Cotton 2.7% Spandex (Excluding the extra stretch part) Materials: Coolmax® 144N COOLMAX® yarn quickly wicks away moisture, keeping feet dry Lycra fabric provides a comfortable, snug fit Breathable mesh construction allows for quick dissipation of heat and moisture. Targeted cushioning under the heel and toes reduces pressure on the foot when walking Mid-foot tightening ensures stability while walking. Seamless toe cap with no sewing prevents toe friction The three-dimensional heel cut provides a snug fit with no slip Polygiene® treatment for long-lasting freshness Sizes: S/M/L