The 'Four' means four inches of cuff length. The 'Sustain' means it's made with sustainable materials REPREVE post industrial recycled nylon. Swiftwick Four Sustain Socks wick exceptionally well and their hydrophobic fabric won't absorb moisture it evaporates quickly. Four Sustain socks even employ light compression to promote bloodflow and reduce fatigue. In other words, these ones have it all.
|Backcountry||$7.20 on sale||$15.99|
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