Insect ShieldA(R) for invisible, odorless protection against mosquitos, ticks, ants, flies, chiggers and midges. Lasts the expected lifetime of the garment. BrrrA(R) Pro enhanced cooling, wicking and drying fibers PolygieneA(R) Stay Fresh eliminates odors formed by bacteria UPF 50+ for the ultimate in UV sun protection Sizing Note: This product features an Athletic Fit. We recommend you size up by one size.