"What Our Gearhead® Experts Are Saying:""I wore this through a string of cold, wet training runs this fall and never felt weighed down or overheated once I got moving. The stretch back panel made a real difference on tempo days when I needed full range of motion without the jacket bunching up.""The Advance Light Jacket is for runners who won't let a forecast dictate the workout. We pull it on before an early morning tempo run when the sky looks uncertain, trusting the hardshell build to handle whatever the weather decides to throw at the miles ahead. A two-layer PU membrane keeps rain out while still letting heat escape, and the four-way stretch back panel moves with every stride instead of fighting against it. Articulated sleeves and a two-way center front zip make it easy to dump heat mid-run, while thumbhole cuffs keep sleeves in place through even the hardest efforts. Reflective details wrap the jacket for visibility on darker mornings, so training doesn't have to wait for daylight."