Your adventurous boy may not be climbing mountains just yet, but he still necessitys a jacket to keep him warm. The Columbia Fast Trek for little boys isn't bulky, but it keeps your active boy warm with 100% polyester 250g micro fleece. If it's a snowy winter day or a chilly spring day, this technical-looking jacket is as nice and lightweight as it is stylish and zippy. The half-zip fleece has raglan sleeves for mobility, and a vertical zippered security chest pocket for storage.