I bought the XL following the size chart, showing 36-38" waist. The white lace version is a bit tight, but still wearable for my 37" waistline. My guess is the lace fabric lacks the stretch that the regular solid fabrics have, so feels tight. I have a solid blue also on order and will update if that is the case. Nice over-all cut and look. Light and breathable. Pouch is accommodating, but not by a whole lot. Not as "enhancing" as I expected from the pictures, but still looks good. Wearing it under a pouch boxer brief and the enhancement is perfect to fill the pouch.A little disappointed by the smallish size and lack of stretch, but it is a well-made product with good workmanship and durability. They don't have a 2XL, but if you can make the sizing work, this would be a great purchase for you.Update: The solid fabric blue one came in and has a lot more stretch. Sizing on that fabric is perfect. Fit is perfect. Bulge is perfect (the lace one is a bit flat, the solid one is the perfect shape). Go for the solid colors and you won't be disappointed. I upgraded my 4 star rating for the white lace to 5 stars for the solid navy. Exceptionally comfortable thong, slight dip in back, exceptional workmanship (well it is the real name brand instead of a Chinese knock-off). Fabric is soft, durable, thick and has great stretch. I'll be buying more.I bought the XL. I have a 37" waist and am a 260lb bodybuilder. The solid color fits a fit body perfectly. Really a good product. If looking for an introductory thong, this is really the one. Or, if you regularly wear thongs, this is still the one!