The idea is not bad, but unfortunately not practical. The rubber soles can slip on with a little effort, keep then but good. But I need to connect the negative reviews I unfortunately. After one use already missing three red spikes. One more than the Ersatzbeutelchen accompanied. If it were only in the 100 package Zun purchse ... so I have to wait now until the snow has melted ... maybe there are then some. ;-)
