Who's afraid of a little heat (or humidity)? This Ultra-Light Coolmax sock isn't. Coolmax yarns are engineered to move moisture away from your skin, to be fast drying and to enhance comfort. True Seamless construction assures a smooth fit and reduces blisters and hot spots. No slipping, no bunching, no bull. These puppies stay put and in place all day. High stitch count means less bulk-more comfort. Still made in Vermont. Guaranteed for life. Coolmax - Because wool is not for everyone. We use an exclusive Coolmax blend to create a sock with exceptional softness, durability and superior moisture management. True Seamless - Using the latest generation of Italian knitting machines, Darn Tough are able to knit ultra-light yet extremely dense socks with an undetectable toe seam, here in Vermont. The result is miles and miles (and miles) of blister-free bliss. Feel the difference of feeling nothing at all!