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The Castelli Mid Winter Sock is a merino wool cycling sock built for cold-weather rides. Merino regulates temperature and resists odor, and the mid-weight knit adds warmth without the bulk of a full winter sock. It suits road and gravel riders who keep riding through fall and mild winter. Against thinner summer socks it trades breathability for warmth; against heavier winter socks it stays closer-fitting and less clammy.
In stock
Store links may earn us a commission. Price via Klarna.
Lowest price we've seen: $15.95 on Nov 9 at Triathlete Sports. Tracked across 1 store since Nov 9.
Riders who wear the Mid Winter Sock praise the merino warmth and comfort on cold rides. Some find it too warm for milder days and note the wool wears faster than synthetic socks.