I wear castelli's bibshorts ($120 a pair) for the past few years, and have been getting about 12k Kms or a season and a bit outta them before I find the chamois is to broken down or they start to wear through on the backend. I do wash them with my other clothes on normal cycle but don't put them in the dryer and don't baby them to much..This got my thinking if this was adverage, good or bad for lifespan. How long do yours usually last!?