Reluctantly, I pulled the Eco-Mesh Shirt by Rail Riders over my head. I cringed. Ick. We were in Belize, it was 90 degrees in the shade, and I dreaded having the cotton-like material over hot, sticky limbs made all the more moist by a vigorous workout in a kayak. And as for the company's claim that wearing this long sleeve shirt would make me feel cooler...They were right. It did. No kidding. Credit the lightweight, wrinkle-resistant, even odor-resistant nylon fabric and mesh vents for this modern apparel miracle.