The coolest hiking shirt on the planet, the Mountain Hardwear Men's Chiller Long Sleeve Shirt features Cool.Q Zero technology to provide an immediate and ongoing cooling sensation. Once activated by sweat, Cool.Q Zero will actually work to lower the fabric's temperature. Besides actively keeping you cool, this wrinkle-resistant, quick-drying, hiking shirt blocks out harmful UV rays with UPF 40 protection.

• Constructed of 86% polyester, 14% elastane Cool.Q Zero Flex Stretch fabric.
• Cool.Q Zero technology provides an immediate and ongoing cooling sensation, when activated by sweat.
• Wrinkle-resistant, quick-drying and durable fabric.
• Seams rotated away from pressure points for comfort under a pack.
• UPF 40 protection guards against harmful UV rays.
• Flip-up sun protection collar.
• Zip chest pocket.
• Sleeve roll-up tab for quick fit adjustments.
• Standard fit.
• Avg. weight: 9 oz.
• Avg. length: 29 in.
• Import.