To use this Kamen Rider Eternal Max Jacket, simply put it on like you would any regular jacket. You can then insert your Gaia Memories (sold separately) into the designated slots. When it comes to sizing, make sure your chest is no more than 40 inches and your thigh circumference is up to 20 inches to ensure a proper fit. For maintenance, it's best to follow the regular washing instructions on the label. Keep it away from sharp objects to avoid any damage. When not in use, hang it up to keep its shape. And remember, the Gaia Memories are sold separately, so you'll need to purchase them if you want to fully recreate the look from the show.