3 would work for a little kid or someone on greens but I'd be legit very concerned in a 3 buckle type boot on a blue or black even if it seemed to fit well. If my leg is moving around at all in the boot aside from a bit of heel to toe from ankle flex, I'd be nervous. I crank those top buckles down. My foot buckles are relatively loose, but in no way do I want the boot even slightly loose up top. It majority affects my control of the skis, both tips and edge angle.
I'm an intermediate skier trying to get more advanced and I am in 100/100 boots. 100 last 100 flex. I'm only 5'9" 160 so I'm not putting a lot of load on the boot at my ability level, but I still want that sucker snug.
I'm an intermediate skier trying to get more advanced and I am in 100/100 boots. 100 last 100 flex. I'm only 5'9" 160 so I'm not putting a lot of load on the boot at my ability level, but I still want that sucker snug.

