The Columbia Skien Valley Long-Sleeve Shirt pairs Omni-SHADE Broad Spectrum UPF 50 sun protection with Insect Shield treatment, so a single layer covers both the sun overhead and the bugs waiting in the brush. A sun protection collar extends that coverage up around the neck, while the 100% nylon build keeps the shirt light enough to wear through a full day outside. Snap closures at the front and cuffs make it easy to seal out drafts or roll sleeves up when the day warms. What Our Gearhead(R) Experts Are Saying:"I stay dry even when the trail turns into a climb because the Omni-WICK fabric pulls sweat away before it soaks through, and the vents keep air moving the whole way up."