From scorched highways to high humidity hill intervals-”you're out there running. While most of us don't thrive in extreme heat, the Vertex does. Coolmax Polyester yarns move moisture away from your skin and dry fast while 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. Discover the perfect sock for runners looking to lose bulk without sacrificing cushioning and comfort when the weather gets hot. Still made in Vermont. Guaranteed for life.