Merino wool is a natural wonder that is soft, warm, and naturally moisture-wicking to keep your feet dry and cozy. Originally made for winter days, we've seen a big increase in Bombas fans wearing all of our merino styles year round. One Purchased = One Donated Design: Sure-Fit Cuff gives you the perfect fit every time and won't fall down on the job Cushioned Footbed: Extreme comfort and extra support for your soles Seamless Toe is linked with a special knit stitch that eliminates the annoying bump that runs across the toes of most socks Y-Stitched Heel creates a natural cup around your heel made to fit your feet Honeycomb Support System cradles the arch of your foot, like a firm but comfortable hug around your midfoot Additional Details Merino wool blend quarter socks : 80% merino wool 18% polyester 2% elastane Machine wash cold on gentle cycle, Use mild detergent, Do not bleach, Tumble dry low, Do not Iron, Do not dryclean, Do not use fabric softeners