Comments about Petzl Charlet Irvis Flexlock 10-Point Crampons:
i took these crampons up Mt. Whitney and they worked great. i did not have a single problem with them losening up. i used them with my La Sportiva Nepal EVO GTX Mountaineering Boots and they matched up great. wouldnt by a different pair if i could.
Bottom Line Yes, I would recommend this to a friend