The Simms Kenai is a versatile fly fishing shirt that has three-season relevance and performance. COR3 technology in the fabric offers sun protection, odor management, and moisture-wicking capabilities. The hollow-core fibers retain warmth on cooler days but the soft cotton is also comfortable when the sun is out. For casting mobility, the seams have been placed off the shoulder. And Simms gave this long-sleeve button-down shirt lots of pockets - two large ones on the chest, and an internal zippered pocket, plus an accessory loop to attach an essential piece of gear. You'll wear the Simms Kenai Shirt so much, other anglers will think it's your only shirt, but you'll know it's just your favorite. COR3 technology blocks sun, wicks moisture and manages odor Hollow-core fibers add insulation Off-shoulder seams aid in mobility Chest pockets, zippered pocket, accessory loop for gear and tools Soft cotton feel for comfort.