Made for staying comfortable all-day and any activity with plush bamboo charcoal cushion in the heel and toe and ultra-thin Skin Thin™ cooling panels on the top. For the best fit, it is important to use the size chart before ordering. Extra cushion in the heel and toe Bamboo charcoal ionized fibers for durable softness Ultra-thin top panel to regulate temperature and increase air flow Included in all Socks with Purpose® Micro-nylon treated with silver-ion technology to keep dry and prevent odor Seamless construction and left/right design for 360-degree blister protection Y-Gore heel to prevent the sock from slipping down into your shoe