FitSok Sock Sizes
Sock Size	US Men's Shoe Size	US Women's Shoe Size
S	N/A	4-6.5
M	6-8.5	7-9.5
L	9-11.5	10-12
XL	12-14	N/A

Sock Geek Says:

 A super underrated sock!

Designed to meet the demands of race-day athletes, the F4 utilizes Shadow Yard fabric to provide compressed venting and moisture management in the most extreme conditions. Made with Sorbtek®, this sock channels moisture away from the foot, keeping it cool and dry. Anatomical left-right foot construction allows for precise fit, while a unique cushioning system provides comfort in specific pressure areas. Achilles protection reduces blistering on the back of the foot, and a front tab protects against shoe friction.

•  Engineered Heel
•  Max Arch Support
•  FlowTech Air Channels
•  Perfect Seamless Toe

A tremendous value for a high performance running sock!

FitSok F4 Sock Specs

Sock Fibers: