"What Our Gearhead® Experts Are Saying:""I wore the Columbia Skien Valley Long-Sleeve Shirt on a week of humid late-summer hiking through some notoriously buggy backcountry, and the Insect Shield technology delivered where bug spray alone never quite does. The roll-up sleeves with snap tabs kept things versatile as the temperature swung from cool mornings to hot midday climbs, and the pop-up collar added just enough neck coverage on the exposed ridgeline sections.""Deep summer trails come with a full checklist of conditions to manage: relentless sun, rising heat, sweat that builds by the mile, and insects that seem personally invested in ruining a good day outside. The Columbia Skien Valley Long-Sleeve Shirt addresses all of it in a single layer, so the only thing left to think about is the trail ahead. Columbia built this shirt for the kind of hiker who wants to spend less time managing conditions and more time covering ground. Omni-Shade Broad Spectrum UPF 50 blocks a wide range of UVA and UVB rays through the lightweight nylon shell, while Omni-Wick construction pulls sweat away from the skin and drives it to the surface to evaporate quickly. Insect Shield technology is bonded into the fabric itself, delivering long-lasting repellency against mosquitoes, ticks, and other insects without sprays or treatments that wear off mid-hike. The sun protection collar pops up for extra neck coverage on exposed sections, roll-up sleeves with snap tabs adjust ventilation as the temperature climbs, and mesh venting on the sleeve and back yoke keeps airflow moving when the trail steepens. Hook-and-loop chest pockets and an interior pocket handle everything from a trail map to a snack bar, and a locker loop takes care of post-hike storage."