🛍️ Check my other Outdoor Research listings and bundle! 🛍️ 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. OR color is called Tropical. Blue photo is just to show how the back looks. Smoke free home. Smoke free home.