I've been buying boxer briefs since my 11 year old was a potty trained.  I have usually bought Old Navy, Gap, Children's Place or similar retailer brands, and these are a good 3-4 inches longer in the wiast (i.e. from crotch to the waist band) than ANY other briefs he's ever owned.  I bought a size large, since he is growing out of size 12.  Good choice, as they seem to fit perfectly (perhaps they run a bit small?)  My son is not particularly picky, but he has said a couple times that they are "like wearing shorts".  Other than that oddity (IMO), they are great.  Bright colors (only gone through a couple washes so far), and he says they're comfortable.