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You know how it goes: when you step out of the car at the trailhead parking lot you're cold so you layer up, but by a mile or two into your run you're sweating like crazy. Head off this problem by dressing in the Stoic Women's Thrive Luminous Vest from the start. It blocks wind and light precipitation to provide vital core warmth, but is so lightweight and breathable you might forget it's there as you start to warm up. Wear it over a tee on cool summer morning runs or under your favorite fleece to boost its warmth on an afternoon skate ski.