Go further in the Smartwool PhD® Run Short Sleeve Top. Designed to tackle distances short or long, this top is constructed from merino wool and nylon to bring you superb next-to-skin temperature regulation and a super comfortable feel. Strategically designed sleeves mean that underarm seams are no more, and chafing disappears along with them. 360° reflectivity offers a safer run when the sun starts to go down and mesh venting gives you breathability where you need it most. We could talk a mile a minute about all of the great things the Smartwool PhD® Run Short Sleeve Top has to offer, but we know you're eager to try it for yourself.