The North Face ThermoBall Eco Vest is lightweight, pack-ready, and perfect both on and off the trail. Stows into its own hand pocket. Slim fit has a modern cut that hugs the body while still leaving room for movement. PrimaLoft ThermoBall insulation PrimaLoft ThermoBall insulation is a synthetic alternative to traditional down insulation. Warmth and compressibility equivalent to 600-fill down. Round synthetic insulation traps and retains heat within small air pock Stand collar provides additional coverage when you need it. Description Best: 75%–100% Recycled or Sustainable Materials, Exploration Without Compromise, Non-PFC Durable Water-Repellent (Non-PFC DWR) Finish, Slim Fit, Stowpocket, ThermoBall™ Synthetic Insulation