Your adventurous boy may not be summiting Mt. Rainier just yet, but he still needs a real jacket to keep him warm. The Fast Trek isn't bulky, but it keeps your active boy warm with 100% polyester 250g micro fleece. Whether it's a snowy day on Mt. Hood or a chilly day in the park, this technical-looking jacket is as comfortable 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.