As I found after lot of research Tonneau covers are used to cover up unused space in the trucks, roadsters, convertibles or cargo beds in pickup trucks. 1 question is still in my mind that are Tonneau covers waterproof? Anybody there to clear that thing, waiting for your reply on that.

 

Yes the covers are made of waterproof material, but often their attachment methods allow water to leak in around them so they will often not keep all water out of say a bed of a truck.

 

i have two different covers on two of my trucks both trucks have plastic bed liners so any little bit of water that make it into the bed side the the lower ribs of the liner while everything else stays dry. ive never really noticed any water in the liners after the rain but then i never really looked to see if there was but i know none of my property got wet on road trips where it rained

 

my leer fiberglass tonneau is completely water/snow/ice/bullet proof.