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What Our Gearhead(R) Experts Are Saying:"This vest is exactly what I need for trail runs in cold weather. The PrimaLoft insulation keeps me warm without adding bulk, and it packs into its own pocket when I start to warm up. It layers perfectly over my running shirt or under a jacket, and the water-resistant shell handles light weather with ease."The Nike Therma-Fit Primaloft Trail Vest is crafted to keep us moving comfortably in cold, unpredictable conditions. Designed with input from trail runners, this vest features Nike's Therma-FIT technology to help regulate body heat, while PrimaLoft(R) Thermoplume insulation provides lightweight warmth without sacrificing mobility. The water-repellent shell stands up to light weather, making this vest a reliable choice for forest jogs or mountain runs. Inspired by the alpine beauty of Mont Blanc, Nike created the Trail collection to thrive in challenging conditions. The vest's classic fit is perfect for layering, and it conveniently packs down into its own pocket when we need to stash it away. With zippered hand pockets and an adjustable hem, this piece brings versatile warmth to every adventure.