Polartec® Power Fill™ is a soft and pliable matrix of polyester engineered with a proprietary hollow fiber construction that is softer and more durable, forming thousands of air pockets that continuously capture and contain body heat, while maintaining a resilient, equalized thermal layer between the colder air on the outside and the warmer temperatures on the inside. A unique controlled melt process bonds the hollow fibers, increasing durability and drapability, eliminating the need for scrims or other stabilizers. This gives Power Fill™ unmatched warmth and design versatility for a wide range of styles and usage occasions. The polyester fiber’s inherent hydrophobic properties also work to ensure that Polartec® Power Fill™ resists moisture absorption and dries quickly, while maintaining a high warmth to weight ratio. Made with industry-leading, cruelty-free, 80% postconsumer recycled content, Power Fill™ insulation technology provides greater warmth retention in colder conditions, without added weight or bulk.