Milwaukee FREEFLEX Men's Large Black Insulated Bib Overalls. Insulated bib overalls that are built for movement. The FREEFLEX insulated bibs are engineered to move freely on the jobsite with a custom crotch gusset and articulated knees. These durable insulated bibs are designed with a quilted lining and protection against wind and water to work hard in cold conditions. Lighter, more durable materials maximize mobility by reducing bulk and eliminating break-in time. Developed in collaboration with feedback from users across the trades through continuous jobsite research.