Outdoor Research ActiveIce Spectrum Sun Mens Short Sleeve T-Shirt

ActiveIce™ technology works more efficiently and effectively than ever before. 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.