It might be sunny and calm at your house but when you arrive at the trail for your daily run, the winds are whipping and the air is downright nippy. Zip up the Dynafit Men's Trail DST Jacket and get moving. Four way stretch fabric moves with you as you pump your arms on your way up a short and steep incline. Once the terrain levels off, you won't notice sticky, clammy arms or a tacky torso since the Trail DST keeps breathing through your most strenuous efforts. Not only does this lightweight jacket zip all the way up to your chin when the breeze is anything but welcome, but it also packs into its own pocket when you're not in need of protection.