Pull on the Aero Short Sleeve crewe before going out for a run or a hike and it's like putting on two shirts. The Aero is superlight and breathable, made from 120gm merino jersey, feels great against your skin due to flatlock seams and a scoop neckline, and fits your body perfectly. When you finish your hike or your run, you'll be wearing a flattering, feminine crewe neck tee that magically eliminates the odor from your workout. It's as if you brought an extra shirt, only you don't have to carry it. Magic! Weight: 120 Featherweight Fabric: 90% Merino wool, 10% Nylon Fit: Regular Layer: First Layers Best for: Running & Fitness, Yoga & Studio Benefits: Lightweight, Breathable, fast drying Features: Flatlock seams prevent chafing, feminine shaped hem