The Mountain Hardwear CoolHiker Short-Sleeve Tee is literally the coolest technical tee on the market for hiking and backpacking. Zoned-in Cool.Q ZERO technology provides an immediate and ongoing cooling sensation to guarantee that you never get overheated. Lightweight 96% polyester, 4% elastane DrySpun stretch jersey fabric dries quickly, wicks away moisture, and offers built-in UPF 25 sun protection to help shield your skin against harmful UV rays. An antimicrobial finish helps control odors, ensuring that you stay fresher longer. Flatlock seam construction eliminates chafing for even greater comfort. The low-profile collar offers a snug, but-not-too-tight fit. Standard fit. Imported.