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The POLARTEC x SPORTFUL VESTALPHA technical base layer vest is designed to provide active insulation and optimal temperature management during mid-seasons and colder months. Made with Polartec Alpha, a fabric developed for the American special forces, it offers an ideal balance of breathability, lightness, and insulating capacity. It keeps you warm during breaks and dry during exertion, making it perfect for variable conditions. The garment is compressible, lightweight, and quick-drying, equipped with a front zipper for easy wearing and removal even on the move. It can be worn directly against the skin, over a light base layer, or as a mid-layer under a windproof vest. The dropped cut and minimal design make it invisible under other garments but essential for maintaining the body at an optimal temperature. This exclusive product is part of a special Fresh Drop, born from the historic collaboration between Sportful and Polartec, celebrating textile innovation and a shared passion for technical cycling. For those looking for a smart and high-performance layer to use all year round.