Men's Simon Rib Knit Roll Up HatCable knit HeatWeaver plush lining Stretchable rib construction Advanced insulating yarn The Heat Holders Mens Simon Hat with distinctively striped rollup is made with advanced thermal yarns and our luxurious HeatWeaver lining, making it warm, super soft, and comfortable, and providing superior insulation that keeps you warmer for longer. It also feels so soft and silky, it's bliss to pull on when the weather turns colder.