15. Alopex Base Layer shirt by Duluth Trading Co.
When the mercury plummets and you’re staring at a long, freezing slog to stay sharp for that spring half-marathon, you need a training shirt that’ll defy the elements right alongside you. Duluth Trading Co.’s Alopex Base Layer was designed for working outdoorsmen, but we’ve found that it’s the ideal, ultra-warm base layer when you’re gonna get sweaty in a frozen-over hell. This spandex-powered mock-neck shirt will conform perfectly to your physique, but without being constricting. It also wicks sweat like a champ. Best of all are the cleverly designed underarm gussets, which allow free range of motion in your arms whether you’re swinging a kettlebell or an axe. ($39.50 for regular, $44.50 for big/tall sizes, duluthtrading.com)
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