SMARTY PANTS... ER, SOCKS. No matter what your profession, if you choose to upgrade your foot cover to the SmartWool PhD Outdoor Medium Crew Sock for cool-weather backpacking, hiking, or strolling, then consider yourself a doctor of smart decision-making.FEATURES Blended composition maximizes the benefits of each separate material while minimizing fabric drawbacks Soft merino wool breathes well, helps regulate body temperature, and is naturally odor resistant Nylon components dry quickly, breathe well, and add extra durability 4Degree Elite Fit system employs ankle, instep, and arch elastic bands for a snug fit, support, and circulation ReliaWool tech on the bottom of the sock combines high-density impact zones along the ball and heel for long-lasting protection Mesh zones allow heat and moisture to escape quickly to promote faster drying to reduce swamp foot Virtually seamless toe construction limits irritation and chafing