High performance path running t-shirt with unique, athletic featuresZipper collar with Merino wool comfort provides the supreme thermoregulation for your extreme workouts.Our versatile short sleeve, PULSE RedTM Men's Zip Trail Runner shirt can keep speed with your most intense exercises. Created with the trail runner in mind, the 9-inch zipper collar is perfect for regulating body temperature level when coupled with the natural thermoregulating properties of Merino wool - this shirt will keep you cool when it is hot, and warm when it is cool. Just unzip the t-shirt when you begin to get hot and experience the natural cooling result as air passes thru our Merino wool shirt - we like to call it the "swamp cooler result". And if you start to get cool, merely zip up the t-shirt to minimize the air flow and experience the Merino wool microclimate which insulates your body's heat. Possibly best of all, unlike synthetics, Merino wool naturally battles odors. Our zip-neck sport shirt naturally protects your skin from the sun throughout your long runs by supplying UPF 50+ protection.We have actually designed this sport t-shirt without any joints under the arms to eliminate any binding or chafing and therefore, make best use of convenience and flexibility of motion. We have actually used an unique, double-needle cover sew to develop smooth, irritation-free joints, while offering our zip-neck sport shirt an athletic profile. Our sport t-shirt has a semi-loose fit with a mid-hip length and slight hem line drop in the back for freedom of activity. There is a little, zipper pocket on the lower right side which has both, an internal and an external button hole for routing your ear phones for your music gamer. The pocket is likewise perfect for a small snack or gel pack or, for you road warriors, your hotel key when you hit the gym. Made with ultrafine, light-weight ZqueTM accredited New Zealand Merino wool and doned with itch-free heat-transer labels on the interior, our zip-neck sport shirt provides utmost comfort and efficiency. The hem is completed with our trademark red stitching.Features and BenefitsDesigned and made in the USA for top-notch American fit, workmanship, and durability.9-inch zipper collar for reliable body temperature level regulation.Naturally offers UPF 50+ protection.Naturally wicking and odor resistant.Naturally keeps you cool on hot days and warm on cold days.Small zipper pocket on the lower right side for a music gamer, little treat or gel pack, or hotel key.Seamless underarms for freedom of movement and ultimate comfort.Our trademark red stitching on the hem.Made with ZqueTM certified, ultrafine New Zealand Merino wool for the utmost in convenience and sustainability.Double-needle coverstitch for smooth joints and interior heat-transfer labels to decrease skin irritation.Naturally super soft and comfortable.ZqueTM is a trademark of The New Zealand Merino Company Limited.