Functional material. Wear-everywhere style. Adventure-ready comfort. Our Enhance Topo Bark Tee is made with a poly-cotton blend and treated with our signature Hydrolix to keep you dry. Raglan sleeves let arms move freely and the classic Oakley Bark logo across the chest does double-duty as a reflective graphic for workouts in low light. High-performance details let you pack every minute in with one, perfect shirt.