Mesh panels increase breathability so you can stay warm in the shade and cool in the sun Reflective details keep you visible in headlights during your dawn jog A back stash pocket holds a cell phone or MP3 player and the cord port near the neckline lets you pipe your music beneath the shirt so you don't snag it on a tree Merino wool fabric balances internal breathability and temperature regulation so you stay comfortable without overheating Icebreaker GT technology blends merino wool with a Lycra framework to improve stretch, increase durability, and accelerate garment's dry time Icebreaker makes its products in a way that supports New Zealand farmers, ensures overall welfare of the sheep, and promotes sustainable manufacturing practices Chest: 24” flat Back center length: 29 1/2” 96% New Zealand Merino Wool, 4% Elastane Excellent condition