There was video awhile ago about them (suchomimus i thk?). They are effective against small drones (small explosives) while also providing a way for soldiers (of either side) to cope with being in an active warzone. The same things happened in WW2 where tank crews put sandbags, extra tracks and even concrete on their tanks for extra protection even though there was no evidence that it helps and even makes things worse with the extra weight.