Features: A breathable vest with two built-in heating elements in the kidney and back areas. The 4-way stretch material and smooth stitching maximize comfort and mobility. Minimal volume allows it to fit perfectly under clothes. It disperses moisture so it dries quickly. Made of windproof, water-repellent treated material that is hard to wear out (the surface will not peel off). Zip protection feature. Fleece material is sandwiched in the collar, and there is also an inner pocket. Masu.