The first time I climbed in this shoe I thought it felt a little stiff to put on but honestly after a day and a handful of pitches it felt broken in and felt much more natural. The break-in period was very short and convenient with very minimal stretch to the shoe. The next thing I noticed about the Grandstone was the Stealth C4 rubber. I was incredibly impressed at how well that rubber stuck to the rock, whether it was smearing on a slabby runout pitch or trusting a dimple on a sheer face...." go to full review