Perfect for shoulder season temperatures between 50 and 65 degrees, Castelli’s Mezza Wool 9 sock is made from 100 percent merino wool that’s only slightly thicker than a summer sock, meaning it will fit easily in your shoe and add warmth. The longer cuff also provides mid-length protection on in-between days that aren’t too cold or too hot. And because it’s merino wool, the Mezza Wool 9 breathes while insulating and naturally resists odor, so you’ll be the only one to notice if you wear them on back-to-back rides. ($17; castelli-cycling.com)
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