well i have a martin down hill bike. and i just do mine the same like 70% paved trails. the rest is just trials and such, like down fish creek area. and i used a heavier pair of shorts for those just incase moments you bail.but i have a pair of Kona shorts that are maybe 2 years old. but i'd go to bow cycle if i were you and get a bit heavier pair of shorts. i wouldn't go light material. but just my opinion.
they have a nice couple pairs there now, i was there the other day looking.