Outdoor Research Echo Short Sleeve Tee Mens Size Medium Measurements: 20” between armpits 26” length Gently used C37-5/15 This t-shirt sports all of the essentials you already love about the Echo Collection, with upgrades that make this the best tee for extreme heat and layering spring through fall. Better stretch and an improved fit let the garment move with you, a more durable and softer hand feel increase comfort and longevity, and eco-friendly mesh fabric featuring AirVent™ moisture management keeps you dry and sweat-free.