Some people shave their heads for aerodynamics; others slide on our Air Flow Cap. It slips through headwinds with a low-profile design and a super-breathable fabric. The shapeable brim has a dark underside to reduce glare and a reflective band along the brim's edge. An adjustable rear buckle with elastic allows you to customize the fit. It also has 15-UPF sun protection and Gladiodor® odor control for the garment.