On the outside this may look like any regular short sleeve Columbia shirt yet on the inside it will be working hard with a range of protecting features. The unique quick drying fabric is also coated with an antimicrobial treatment which prevents bacterial growth, whilst at the same time offering UPF 50 sun protection. Add a back with vented panel and you have a perfect companion for your next trail. - Omni-WICK™ moisture wicking fabric - Omni-SHADE™ UPF 50 sun protection - Antimicrobial treatment protects this shirt from bacterial growth - Quick dry inside mesh panel - Vented