Lululemon Plum Run For Cold Jacket - Size 4 Lululemon Plum Run For Cold Jacket - Size 4. Designed with strategically weighted Primaloft® Active insulation, this jacket aims to keep you warm where it counts. Synthetic insulation retains warmth when it gets wet and the low-profile loft allows you to stay flexible and nimble. We also added reflectivity to help keep you visible in low light. Stretch Glyde water protection: Stretch Glyde and Fleece fabric are both water-repellent water-repellent #Activewear #Running