Product DNA What's It Do? You should never have to worry about the weather. That's why we built this ½-zip with water-resistant panels and UPF 50+ fabric. Designed to be smarter than anything you've ever run in before, all of our UA Qualifier gear works together—or on its own—to keep you focused. We've covered the details, you just run. The Fundamentals Fitted: Next-to-skin without the squeeze HeatGear® fabric is ultra-soft & smooth for extreme comfort with very little weight UA Microthread technology in the fabric dries faster, won't cling to you, won't chafe and stretches without absorbing sweat Mesh underarm panels for strategic ventilation Woven overlay on the shoulders & chest provides added durability Four-way stretch construction moves better in every direction Material wicks sweat & dries really fast Generous, ½-zip front makes for easy layering Dropped, shaped hem for enhanced coverage Built-in thumbholes help keep sleeves in place Imported