OK, so this belt is full grain leather, but it's VERY stretchy. I seem to be a size 38. I was recommended a size 40 belt but it was too loose so I had to add extra holes to the belt. The belt is size 40 but it was too loose so I had to add extra holes to the belt. I didn't like putting holes in a brand new belt. But I almost feel like I need to add more holes. The leather belt has never stretched. It's a lot and I'm not losing any weight trust me lol so looks like I'll have to get 38 pretty soon if not 36 make sure you get the right size. I would even recommend going down a size 4 Choose the size of belt that fits the waist of your pants. So if your pants size is 38, take a 38 belt.