100% post consumer recycled polyester leg. Space dye injected yarn to reduce waste and provide swirls of color. Merino wool bottom. Absorbs moisture and dries quickly. Breathable for temperature regulation. Like your shoes, these socks come as a right and a left pair. Material: MERINO WOOL 36%, NYLON 36%, Recycled POLYESTER 25% , LYCRA® SPANDEX 3%. size small fits women's 4-6.