i bought something from habitat for humanity at their restore to block the wind on my run. it is some kind of insulation but i dont know what. it is one forth in. thick, pink inside with thin plastic sheeting on both sides. i have heard alot about the chickens eating styrofoam but mine has ate big holes in this unknown material before i could blink. i have tacked sheets over it now and they cant reach it any more but i wonder if the damage has already been done?