When it comes to running in heat and humidity less is more. Our Vertex 1/4 socks made with Coolmax deliver cool comfort in the most challenging conditions. Coolmax Polyester yarns are engineered to move moisture away from your skin and be fast drying. This super stripped down ultra-lightweight sock is great for runners who love a cool and "barely there" feel when the temperatures soar. True Seamless construction reduces hotspots and blisters. Ultra high stitch count creates a super comfortable sock with a streamlined fit like no other. No slipping, no bunching, no blisters. Still made in Vermont. Guaranteed for life.