LL Size Range (Waist) 103cm - 138cm I only tried it on once. I will also send the book by Ryosuke Miki as a set. You flatten your stomach and then tighten it with the belt. My waist is 100cm, so I'll switch to size L because I won't be able to use it soon after I start using it and lose weight. Let's do our best every morning while watching BS10 at 6 o'clock!