展开Best-selling ActiveIce technology works more efficiently and effectively than ever before. Outdoor Researchs 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. The ActiveIce Spectrum Sun Hoodie was built for total coverage and comfort, featuring a chafe-free design and dynamic reach to let you stretch, move, and take on the heat.