The 1000 Mile 3 Season Walk Sock has carefully chosen padded zones to offer complete protection and comfort A padded heel extends to cover the Achilles tendon while other padded zones cushion the ankle bones toes and ball of the foot The combination of soft merino wool with top and arch venting allows the foot to breathe and maintains an even temperature This product contains Merino Wool Merino wool is one of softest types of wool available and is perfect for regulating body temperature The wool provides warmth without overheating the wearer and its moisture wicking properties combined with being slightly moisture repellent allow the wearer to remain dry