Knee Support (Set of 2)

I bought this to use when I injured my knee, but the size didn't fit. I've only used it once. I threw away the packaging bag with the description on it, so I don't know the material or size. Considering my body type, I think I bought a size M. It was stored in a dresser. It has been stored for about 4 years. Thank you for your understanding regarding home storage and amateur inspection.