"What Our Gearhead® Experts Are Saying:""I put the Columbia Zero Rules Lite Hoodie through a long exposed ridge hike on a bluebird day and the Omni-Freeze Zero fabric genuinely surprised me. You could actually see the blue rings activating as I heated up, and the cooling effect was noticeable enough that I stopped thinking about the temperature and started thinking about the views instead.""The climb that looked manageable at the trailhead has a way of revealing itself about two miles in, when the shade runs out and the trail pitches upward and the sun starts pressing down in earnest. The Columbia Zero Rules Lite Hoodie is what you want between you and that moment. UPF 50 protection keeps the UV rays at bay while Omni-Freeze Zero technology goes a step further than standard cooling fabric, using sweat-activated blue rings that visibly absorb moisture and accelerate evaporation to deliver active, sustained cooling right when the effort peaks. Columbia's Omni-Wick runs throughout to pull moisture to the surface quickly, and the active fit keeps the fabric close enough to move efficiently without feeling restrictive over the long haul. Thumbholes lock the cuffs in place and extend coverage over the backs of your hands, closing off one more gap when the sun angle drops and the exposure shifts. This is a hoodie that earns its spot on the trail by solving real problems in real conditions."