Gaiters

Gaiters stop snow going into the top of your boot and also make a neat finish to your trousers to stop them catching in your crampons. Pretty much any model will do from full length through to the mini "Stop-Tous" short versions.

Try to avoid models that have buckles on the inside of the foot, as these have a habit of attracting crampon points. If you are really not sure, they can easily be picked up in Chamonix on the first morning of the course.