Internal urethane is not included. It can be used without any problems, but it has scratches, scuffs, cloudiness, and dirt as it has been used. Please be sure to make your judgment based on the images. ■ Waterproof, shockproof, and dustproof ■ Solid wall, covered continuous air cell structure: achieves both durability and weight reduction ※ Please check the official page, etc., for the exact specifications and specs.