I have had these (and similar pairs on another order) since Oct 2012.  I have several pairs of various boxer briefs, so they aren't overworn.  Almost in parallel, the waist band for these, and the other Adidas pairs, have all failed, becoming wrinkled and having lost their elasticity.  Now what I would expect or require from Adidas.  I always wash my stuff on cold and use minimal detergent.  I don't track underwear life in a spreadsheet or anything, but this short duration seems way too short for service life.  I have Calvin Kleins that have held up until they were out of style or fading.