Most of us couldn't agree more with this sentiment. But most of us also don't want to walk across a short section of ice wearing boots for an alpine rock climb and then carry said boots in our backpacks when we put on our rock shoes.
Sometimes it makes a lot of sense to wear crampons on approach shoes. It's not comfortable and it's not fun. Indeed, half the time that you're doing this, it feels like your foot is going to come right out of the shoe. On every step the crampons stick in the ice and have a nearly imperceptible hold your foot. It feels a little bit like you're walking in sticky mud.
Approach shoes were not designed for such a use. They bend easily and it is difficult to walk up steeper terrain while wearing them. The strap-connectors on many crampons are hard plastic and these commonly dig into your ankles.
There are some crampon styles that work more effectively with approach shoes. Aluminum crampons are not really designed for standard mountaineering where you are going to wear your crampons all day. Instead, such crampons are light, have a low profile and often fit well on approach shoes. Aluminum crampons like the Black Diamond Neve Strap Aluminum Crampons and the Stubai Ultralight Universal Crampons are perfect for this type of use.
The pain of crampons on approach shoes is at least somewhat worth it. As with so many other things in climbing, the pleasure comes after the pain. And in this case, the pleasure is no heavy boots in your pack while working your way up a massive alpine rock climb.
--Jason D. Martin
