I have never had any crack and used them all last winter. Not sure if mine are the older ones though. I beat the crap out of mine no problems yet. Are they cracking at the seam? Maybe defective Chinese plastic...
I haven't broken one, but mine sure dude freeze together and boy are they tuff to get apart sometimes I leave them in the sun will I run solution hose in and wait for it warm slightly.
hmm... odd problem. we have seen more problems with the older cool cuffs cracking. the new ones have been much more durable from we have seen. maybe a bad batch of plastic or something?