I'm selling this jacket because it doesn't fit me. I purchased it here. It's size 4, but the tag has been cut off. I think it's equivalent to a Japanese size S or XS. This heather gray color seems to be hard to find, so I recommend it to anyone looking for it. Here's the previous seller's description: ------------------ A Lululemon classic, a staple item Define Jacket Nulu Size: 4 This Lululemon classic jacket makes your style look great. It can be worn alone in the fall and spring, and in the winter, you can wear a coat over it without feeling bulky, and it will keep you warm. I didn't wear it during lessons, so I don't think I wore it for long, but I think there might be a little bit of wear and tear from wearing a coat over it. I think it's at a level that doesn't cause any problems when worn or seen, but it's just my personal opinion, so please check the photos. - Color: Gray - Design: Zippered, long sleeves - Style: For fitness, tight fit - Collar design: Stand collar *** From the website Slim A sleek silhouette that hugs the body The length covers the waistband, providing the perfect amount of coverage for everyday wear Product features Thumbholes and Cuffins™ prevent sleeves from riding up and keep you warm Secure pockets on the front Ventilation design on the back ensures breathability Nulu™ material with a soft, smooth feel that doesn't feel heavy Soft, smooth feel that doesn't feel heavy 4-way stretch that stretches in four directions Sweat-wicking Breathable Blended with Lycra® elastane fiber for stretch and shape retention I washed it with organic detergent. Thank you very much.