Making two mesh colliders collide

First, I CAN'T use box colliders because I have multiple meshes that are used as the player and making custom box colliders for each would be a pain. But when I use a mesh collider for the player it doesn't even detect the environment mesh collider (w$$anonymous$$ch also can't be a box collider). In addition, with a box collider for the player it works most times but I've found that if I $$anonymous$$t a t$$anonymous$$n object that is part of the mesh in the center of the box it passes through so I can pretty effectively navigate withough touc$$anonymous$$ng anyt$$anonymous$$ng. So how can I make 2 mesh colliders actually collide.