Crushing glass can get pretty dangerous, but I don't care. Watch me crush a couple light bulbs under my heavy, sherpa lined winter dr. martens. They're made with brown leather and have tons of wear from two winters. The sherpa makes my feet sweat and has absorbed a lot! They're very smelly, especially when worn over my dirty black crew socks that make my feet kinda itchy. Wanna see these crush under my big, size 11 feet and get shards of thin glass stuck in the soles? Do it! If I lowered my sharp soled foot onto you, would it hurt?