Design PhilosophyAs one of the only a handful of cycle brands using PrimaLoft®, Endura continue to develop Pro SL products that expoit the benefits of this incredibly lightweight insulator.The Women\'s Pro SL PrimaLoft® Gilet brings technical hollow fill insulation to the performance cycling market in the form of a versatile, packable gilet. Lightweight InsulationTwo different types of Primaloft fill have been used. 80g of PrimaLoft® Gold has been used on the front torso, maximising insulation exactly where you need it most. 60g of PrimaLoft® Silver Active has been used on the back, giving improved breathability and accomodating some stretch to create a great fitting garment.PrimaLoft® Insulation PrimaLoft® insulation boasts an exceptional warmth to weight ratio, tiny pack size, extremely breathable construction and is highly water resistant making it a tremendously versatile performance insulator.