The Columbia Zero Rules™ T-shirt is designed for intense activities in hot weather. It is ultra-lightweight and stretchy, incorporating Columbia's innovations for continuous cooling.

• Sweat-activated cooling technology (Omni-Freeze ZERO™) lowers fabric temperature on contact with sweat.
• High-performance moisture-wicking system (Omni-Wick).
• Designed for intense activities in heat.
• Ultra-lightweight and stretchy fabric.