In the world I'm creating, a branch of humans from prehistoric earth were casted away to another diminsion  by reality bending beings. The diminsion exists as a large cavern filled with giant Earth arthopods and plants. It's strange laws of physics allow both organisms to survive with no negative side affects. But the problem with the humans is that some of these creatures have an intrist in killing them with there own natural weaponry. The humans proposed a way of surronding there own bodies in a suit of armour to for further survival. But the issue I'm running into is what material could they use as armour that is effectivly durable, lightweight  and protective against getting punctuated by stingers, claws and mandibles? 

A few materials I thpught of were exoskeltons from other insects. Though the problem with exoskelton is that stinging specicies could easily penetrate through.

Also for the details on the humans, they run, jump and carry as if they're on earth, so they can't lift many times there own bodyweight or run faster, but they can oddly stand on some of the arthropods without killing them, so they are light to the arthropods, but not to themselves.