I bought my first pair of super undies last summer when the original super undies kids Site listed them in a xxxl. I watched the Site for weeks and all of asudden they had triple x large. They only sold them for about a week and a half and stopped, I can only figure demand was huge. Recently they have been selling adult sizes at adultclothdiaperme.com the Site is directly related to the original super undies Site but if you are not real big you can fit in the kids sizes just fine I have. A 29-30 inch waist and I am really comfortable in the kids size xxl and xxxl. AND the best part is you can get the kids sizes at a huge discount at cloth diaper outlet .com I got three pairs for under fifty dollars and I just love them. If you wear diapers every night these can save you lots of money and washing them is so easy. If you have any questions about super undies let me know!!!!!!