Your adventurous boy may not be summiting Mt. Rainier just yet, but he still needs a real jacket to keep him warm. The Little Boy's Columbia Fast Trek Full Zip Fleece isn't bulky and it keeps your active boy warm with 100% polyester 250g micro fleece. Whether it's a snowy day on the mountain or a chilly day in the park, this technical-looking jacket is comfortable and lightweight. This full-zip fleece has raglan sleeves for mobility, and a vertical zippered security chest pocket for storage.