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You should be able to buy the parts, and maybe they will even fix them free without the receipt. They fixed mine under warranty with just the receipt, no packaging. Mine have cracked at the ends of the headband, I got them fixed and they are doing it again within a couple of months of light useage.
I'd suggest emailing Sennheiser, check the Senn websites, there is a main one and two or more others for USA, Canada etc. I politely described what was happening to mine and suggested the material on the headband need to be stronger, and they are investigating the problem (I hope).
They need to use a testing machine like the chair tester at IKEA, to make them "strong like bull", like my 24 year old Volkswagen Jetta which still has the original brake pads, brake fluid, clutch, transmission oil, etc.
Here is how mine look right now, eventually the end of the headband will break off. The other side has smaller cracks. Picture is the bottom 2.5 inches of the right side headband.

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