BumGear has, perhaps, the best pair of mesh boxers I've worn. I must say, I originally bought these for a special weekend away. I had anticipated these to be super sexy but not very comfortable – boy was I wrong!!
The mesh material is extremely soft with good stretch (94% polyester/6% spandex), the waistband is comfortable, and they fit perfectly. These are so comfortable they are now part of my daily wear selection (in fact I'm wearing them now). I picked these up at Erogenos for $28. They're on the higher end for price, but worth every penny.
You really need to check these out for yourself, you won't be disappointed!