I started off riding an XVS250 and it was good but after about 100km I'd get a painfully sore arse. Now I have upgraded to an XVS650 with a much bigger seat and I still get a painfully sore arse after about 100km. So I put a lambswool cover on the seat thinking that would help, and it does absolutely nothing. If anything I think it's worse. Shifting my weight around while riding doesn't help. Standing up does help but it isn't practical. What do other people do to avoid a sore bum?