I know my size and I hate shopping.  So far, I've bought five pair of these from Amazon and I don't have to leave the house to do it.  I typically get a few years out of a pair before they're due for reassignment to lesser activities, but I only throw them away after they no longer keep my man parts out of the weather.  If these last as long as they have in the past, my next purchase will be stretch pants for a trip to the early bird buffet.