Define Jacket 1. Layer Lululemon Define Jacket Size 4 NWT white Define Jacket 1. Layer on this warm, lightweight jacket before you hit the hiking trails or head to the studio 2. Luon® fabric is soft, sweat-wicking, and four-way stretch 3. Added Lycra® fibre for stretch and shape retention 4. Thumbholes and Cuffins™ keep sleeves down and chills out 5. Slim fit, hip length white, lightweight, athletic, slim fit, thumbholes, stretch fabric, sweat-wicking, hoodie style, running jacket, modern activewear on this warm, lightweight jacket before you hit the hiking trails or head to the studio