Showerproof Isoflex shirt with airflow panels. Hard-wired for the trail. Our short-sleeve Kioga Shirt uses 96% woven polyester with 4% elastane for full-motion stretch. The soft-wearing fabric protects from summit showers with a DWR (Durable Water Repellent) finish. Underarm mesh provides airflow in humid conditions. The double layer collar can be worn up to protect from the heat of the sun. With a trim, zipped pocket to on the chest and the signature R on the left arm.