Outdoor Research Men’s ActiveIce Spectrum Sun Long Sleeve Tee

Self-cooling technology that dynamically adjusts to your body temperature, making overheating a thing of the past. This shirt has the highest level of UPF 50+ sun protection so you can start feeling cooler for longer today.

Best-selling ActiveIce™ technology works more efficiently and effectively than ever before. Our proprietary self-cooling technology now reacts to increases in your body temperature by dynamically cooling you faster when you need it most. A special additive drives this cooling process via phase changes, which keeps the wicking, breathable, and quick drying ActiveIce™ technology the ideal solution for anyone who spends serious time in hot, sweaty, sun-baked conditions.