very lightly used. in fact, I just bought it on MP but turned out to be a bit to small. heres what marmot says about it:

At only 5 ounces, there's no excuse to leave the Marmot Ion Windshirt behind. The Marmot Men's Ion Windshirt fits in your pocket and weighs only 5 ounces, making it ideal for ultralight backpacking and climbing. The key to this incredibly light jacket is the water-repellent, wind-resistant, breathable Banshee nylon material backed up by Marmot's moisture-shunning Defender DWR. Run, hike, or climb in all but a torrential down pour with this lightweight windbreaker. A single chest pocket on the Ion Windshirt gives you a place to stash snacks without adding undue weight. Marmot also added a hood to keep you from getting soaked if an unexpected rainstorm dumps on your trail-running parade.
$40 shipped