SHOCK ABSORPTION, BREATHABILITY, AND A BRIGHT PRINT TO BOOT - THE SMARTWOOL PHD RUN LIGHT ELITE PRINT MICRO SOCK. These socks are sure to keep you feeling good. The Smartwool PhD Run Light Elite Print Micro Sock features body-mapped mesh zones for breathability, ensuring you stay cool and dry throughout the day. You won't have to worry about this sock sliding down your heel thanks to the achilles tab, and you'll love the performance-oriented fit offered by the 4 DegreeGao elite fit system. FEATURESIndestructawoolGao technology for enhanced durability10 DegreeGao elite fit system for a dialed, performance-oriented fitBody-mapped mesh zones for added breathabilityVirtually SeamlessGao toe for enhanced comfortAchilles tab designed to prevent sock from slipping down into footwearWomen's specific fit; narrower heel and slimmer fit