Those DC's may not have an actual rubber sole. It may be that foam shit. It makes the boots a little lighter, but that shit sucks for durability and for hiking. Actually, looking at your pics again, that's exactly what it is. If you look at the black and green portions that are actual rubber they're not all chewed to shit like the white portion.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz