The POL-FS7XL Polar Bear Camera Cover is designed to keep the Sony PXW-FS7 with XDCA extension & battery warm in cold temperatures. It has a black nylon fabric exterior and is thickly padded and constructed of high-loft insulation. The interior is lined with a temperature-stabilizing, phase-change material (PCM) that helps keep warm air in the camera chamber. Air activated warmers can be placed inside the case to maintain interior temperatures in extreme cold temperatures (Portabrace Polar Covers have been tested at minus 50 degrees Fahrenheit).The POL-FS7XL can be used with a matte box or standard lens. The attached insulated lens cover protects the lens in transport and prevents condensation from forming when bringing the camera and Polar Bear case in from the cold.Touch Fastener strips line the interior of the Polar Bear for arranging optional air activated hand-warmers (Portabrace Polar Heat Packs).Two-hand openings at the lens and one by the viewfinder are enclosed with cotton cuffs that keep hands warm.The POL-FS7 has three sets of zippers that make it simple to put the cover on and take it off. The snug bottom zipper around the tripod plate, keeping out the cold when using the camera on a tripod.