The Orvis Pro Sun Crew Shirt – Marine is the perfect lightweight fabric shirt for tropical sun and heat. The PRO Sun Crew is made of Polartec Power Grid bi-component knit fabric that spreads moisture quickly over a large area to provide rapid evaporation and enhanced cooling. This crew features the Highest-rated UPF 50+ for maximum sun protection, gussets in the underarms for unrestricted movement, integrated thumb holes for back of hand protection, Polygiene odor control for extended wear and a concealed pocket hidden in the side seam.