Xantrex 110W Solar Max Flex Slim Panel One Size. Designed with a highly protective top-layer called ETFE (Ethylene-Tetra-Fluoro-Ethylene) this allows for better light transmittance corrosion resistance stain-resistance weather resistance and overall superior durability over a wide temperature range compared to non-ETFE semi-flexible panels. Easily customize and extend your solar system using our expansion kits. Specifications for Xantrex Solar Max Flex Slim Panel: Manufacturer: Xantrex Color: Black Additional Features: 110W Package Contents: Xantrex Solar Max Flex Slim Panel Xantrex 784-0110S: 110W Solar Max Flex Slim Panel One Size