I'm curious if anyone has had the X-Treme after the Crossfire TA. They are marketed as a little bit more 'off-road' than 'MX', if you look carefully there is very, very little difference. The only change I can see is that on the outside near your little toe, the Crossfires have an extra plastic protection pad, and similar on the inside, side of the boot. I would suspect that they are are bit more hard-core than most ADV style bike boots. The lack of that above-mentioned protection pad 'might' mean they have a little more 'give' around the outside of the foot. Perhaps this difference is somewhere else, but I can't see it. Most cheaper boots, including MX boots don't have half the protection. Have a careful look below. Also curious about sticking giant knee guards in. (My old Sidi Crossfire 2 TA, had plenty of room, my current (wornout) cheapie boots - well you have to leave the top clips undone and only use the velcro bit.) Edit: and I found this First the X-Treme: And the Crossfire 2.