HIGHEST QUALITY: Sweat absorbent premium mix of 73% Soft Cotton, 25% Polyamide, 2% Spandex. INVISIBLE AND NON-SLIP: Completely invisible, thin, stretchable yet durable. Our socks have a non-slip silicon gel heel pad to avoid sliding off the hill. IMPORTED FROM EUROPE: Our eco socks are proudly made in Ukraine and are OEKO-TEX certified. So they are eco-friendly to human and environment. OUR PROMISE: If you are not satisfied with our product, we will gladly refund you full amount within 30 days of purchase. No hassle, no questions asked! CARE: Machine wash in cold water and air dry. We recommend to AVOID tumble drying, dry cleaning, ironing or bleaching for the long happy life of your socks.