Old school mountaineers used metal nails, hobnails, in the leather soles of their boots for
added traction on ice.
Here is a method to do something similar with your running or hiking shoes. You could even
carry this lightweight kit with you into the backcountry for icy trails.
1. Small 1/4″ bit driver. The one shown is mostly plastic and the rest aluminum so
weighs very little. Some multi-tools have this on them as well. A tiny wrench could work.
Chuck one in a drill for quick at home attachments.
2. 1/4″ hex head sheet metal screws. Use the shortest ones you can buy so it won’t go
through the sole to your feet.
Just twist them in. You can remove them for the summer season or when you need to walk
across someone’s hardwood floor.