The PhD® Ultra Light Kneehigh adds the fun of a throwback tube sock to your run, but with all the benefits of modern, high-performance Merino, Smartwool's 4 Degree Elite Fit system, and a virtually seamless toe.
4 Degree™ Elite fit system uses two elastics for greater stretch and recovery to keep the sock in place
Patent pending ReliaWool™ technology in high impact areas provides longer lasting protection to keep feet comfortable
Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management
