SmartWool Unisex PHD Light

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Smartwool PhD® Light features ReliaWool technology for improved durability in the heel and toe and the 4 Degree elite fit system, to keep the sock in place and give you all-sport versatility.


  • ReliaWool Technology
  • 4 Degree Elite Fit System
  • Strategically Placed Mesh Ventilation Zones
  • Flat Knit Durable Toe Seam


ReliaWool Technology: Providing longer lasting protection, that helps to keep feet comfortable.
4-Degree Fit System: Provides a performance fit by placing bands in specific areas - Ankle/Upper in step/Lower instep/Arch.

SmartWool use high quality Merino wool in all of their products. This gives them the comfort, performance and durability that you need from your socks; which means you are free to enjoy the journey and move with luxurious comfort.


The great thing about Merino wool is that nature has given it all the qualities you want from an outdoor material. It’s both warm and breathable, giving it exceptional performance as well as being both hardwearing and yet incredibly soft against even the most sensitive skin.

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