I was looking for slim fitting boxers that were not cotton.  These fit the bill incredibly well.  I am very slim and purchased size med (I wear a 31 - 32" waist).  The crotch on these is designed to fit better than traditional boxers (your junk is not either on the left or right of the crotch seam).  They are slim fit, the waistband is not too tight, and the nylon material does not bunch up like most boxers do. I have been a brief/bikini person most of my life, but boxers are what I am wearing lately.