This is a Phiten sports back support. The size is 100, which is probably LL size, but it's adjustable, so it should fit most people. I've only tried it on, but the white sticker on the back is peeling off in places, so please be aware of this and understand before purchasing. It has been cleaned at home. Please understand that returns and cancellations after purchase are absolutely not accepted unless there is a defect on my part. Thank you for your understanding before purchasing. #Phiten #PhitenSupporter #BackSupport #PhitenBackSupport #PhitenWaistSupport #Phiten #phitenSupporter