"What Our Gearhead® Experts Are Saying: ""I grab this for hot-weather hikes when I know I’ll be sweating. The Omni-Freeze™ Zero tech really does kick in once you start moving, and Omni-Wick™ keeps things from feeling soaked. It’s lightweight, breathable, and the UPF 40 protection is clutch on exposed trails. Great high-output summer piece."" When the trail bakes under summer sun, we stay cool in the Cirque River Pro Short-Sleeve Crew Shirt from Columbia. Part of the Titanium collection, it’s built for high-performance days where heat, miles, and exposure are all part of the plan. Omni-Freeze™ Zero activates with sweat, using blue rings to enhance evaporation and deliver lasting cooling comfort. Omni-Wick™ pulls moisture away from the skin for fast-drying performance, while Omni-Shade™ UPF 40 helps guard against harmful UV rays on exposed ridgelines. Lightweight and breathable with a comfortable crew design and locker loop for easy hang-dry, this shirt is made to keep us moving confidently through hot-weather hikes."