I bought theses boots and rode them in mammoth for a weekend...gave me blisters on both heels and were very stiff for a 6 out of 10 rating. I have flow bindings and these boots were just too big for them. They made it awkward to ride with massive toe and heel drag. I ended up having to set my bindings back to even everything out. Ive had northwave and thirtytwo boots same size with no problems at all. The only cool thing about these boots was the fast track lacing system, it was quick and easy.