This is an inner vest for workwear, for summer. Made in Japan, it's old. I think the size is free. A man who wears 4L wore it, so it can be worn by large people. You wear it by putting ice packs in the pockets. It comes with a cooler bag to carry the ice packs to the site. There were 9 ice packs. There were 13 pockets in total, so I don't know if the missing ones were lost or if this was the original number. I think it's just right to use 4 in the front, 4 in the back, and 1 behind the neck. Even with 9, it's quite heavy... For those who think of it as cooling + muscle training. For those who are confident in their physical strength. It smells like latex? Rubber-like smell. There is a cat. Please refrain from purchasing if you have allergies to animals or rubber. An amateur is measuring and visually inspecting with household tools. Please forgive any errors or oversights. Thank you for viewing.