A Wick.Q EVAP shirt designed for those who pack it in. Don't let its casual look fool you. Wick.Q EVAP makes this UPF 50 hiking and trekking shirt an elite performer. A network of tiny chambers within its fabric spreads moisture over a greater surface area for faster evaporation and a smoother, drier feel than other wicking systems. Body: Tipa Warp knit (100% polyester).