I've been having the same problem this winter with my Terry Thermofleece tights and the Terry sadddle on my MTB. The saddle is the cheaper version of the Butterfly I have on my road bike. I'm riding my road bike more, finally, and haven't noticed any additional wearing. I think the material of the cheaper saddle is the cause. When it gets wet or damp it seems to feel sticky and that happens alot here in the winter. bikerHen