What Our Gearhead(R) Experts Are Saying:"The single-knit construction is breathable and moisture-wicking, and the 40+ UPF protection is built into the fabric, so it doesn't wash out over time."Why We Like ItThe Capilene Cool Sun Shirt earns its place as a technical layer through construction rather than coatings. The textured back elevates the fabric off the skin for better airflow during high-output hours, and minimal seam construction reduces chafe on long days on the water or in the mountains. Thumbholes at the cuffs keep the sleeves secure, covering the skin that other sun shirts leave exposed