The Trek Extra Light is an extra-thin sock that gives you maximum control and feel in your shoe. But don't be fooled, this doesn’t compromise protection or thermal regulation!Designed for high-top shoes, this model will appeal to fans of fine socks made with merino wool: it contains 63% merino wool! This ultra-thin model maximizes breathability and drying, so no more worries about overheating!A seamless toe to protect your toesReinforcements at the heels, toes, ankles, metatarsals, and shins ensure a soft interface with your shoeA ventilated construction for maximum breathability and dryingThanks to its reinforcements and ventilation, this model will protect you from blisters and temperature extremes, while providing maximum control due to its thinness.63%: Wool24%: Polyamide13%: Elastane