Lululemon Nulu Define Crop Jacket in Black. Size 4. Whether you're up for adventure or ready for downtime, this shortened version of our fan-favourite Define Jacket has a feel-good fit that can do it all. Designed for Casual. Fit and Features Slim Fit, Waist Length Skims your body Not too short, not too long, just right around the waistband Product Features Zippered pockets Thumbholes and Cuffins™ keep sleeves down and chills out Locker loop for easy hanging Zipper garage keeps chafe in check Elastic zipper pull doubles as an emergency hair tie