A good night's rest means having a clear conscience, too. Sleep easy with PrimaLoft Eco recycled insulation in your Flare 30. Made from post-consumer recycled polyester, PrimaLoft acts like down for warmth, but retains its insulating properties when wet. We've adapted the Flex construction to Ultralight bags, using expandable-baffle Flex from the shoulder to the knees for comfort, without adding significant weight.