Elastic failure: is my washing regime to blame?

Sorry, coming back to this thread very late. I wash at 60C because I have twins who share the nappies, so I want to be really sure to kill any bugs, plus one baby gets bad nappy rash which seems to get worse when I've used 40C washes. So... as we're about to move up to size 2, can anyone recommend a fitted that is robust to hotter washes? Or am I just being paranoid with the 60C washes?

I wash at 60 for the same reasons hun! I have a nature babies bambini which seems to be holding up well!

Thanks. The bambini looks good, but I tend to favour a cotton fitted with bamboo booster for drying time. Anyone know of something cotton with strong elastic out there?