though rain goes right through it.  When the tree pollen hits it and then rain, the pollen will sorta seem through and leave some marks on the truck.  Not great, but better than the huge amount of needles I would have otherwise gotten.  So I am happy. Also the cover will not pack down easily into the bag provided. So plan on someting for that if you have a need.  otherwise, it fit nice on the tundra (with canopy) and looked good. never came off in wind.