These boxerbriefs are very comfortable with no issues of riding up. The sizing is equivalent to sizes 36-38. Make sure to order either one size or two sizes up. I normally wear size 34-36, so I ordered these in XXL, and they fit great. The XL is a little snug so be wary of ordering thr correct size.

They make your little guy look HUGE by the way, so I guess that's an added bonus.