^depends which bit you are talking about.
If you mean the tweedy-looking membrane, snagging it on sharp edges would ruin how it looks but it would still be able to support the rider's weight, due to the support material still being leather or similar. That said, if the cover looked shit you would want to replace it, really.
Brooks-y leather membranes should be able to stand up to that sort of torment. I haven't tested the seatbelt one yet, but will let you know if and when...
^depends which bit you are talking about.
If you mean the tweedy-looking membrane, snagging it on sharp edges would ruin how it looks but it would still be able to support the rider's weight, due to the support material still being leather or similar. That said, if the cover looked shit you would want to replace it, really.
Brooks-y leather membranes should be able to stand up to that sort of torment. I haven't tested the seatbelt one yet, but will let you know if and when...