Prudent layering pays off big time when bone chilling weather presents itself, and the Grundies(TM) base layer collection was designed to help you retain a vital resource, body heat. Offering a variety of material weights combined with HeiQ(TM) Anti-odor properties the Grundies(TM) collection provides a modular layering system that can be worn in many combinations depending on the conditions you&&';;re faced with. Performance, Lightweight Base Layer HeiQ Anti Odor Properties Moisture Wicking UPF 30 Sun Protection Raglan Sleeves for Maximum Flexibility 3M Reflective Chest Logo Flatlock Seams to Prevent Chaffing Performance, Lightweight Base Layer