Bob, boot size is 28, I'm 5'10" 180#. I'm a production manager for a small ski manufacturer so part of my job is product testing. I don't own an alpine boot so my TXpro's end up getting shoved into all manner of skis, all different sizes and shapes, but all Wagner, mostly with Marker bindings. I totally agree with blutzski; this boot is WAY underpowered for an alpine setup, tongue pressure is nonexistant. I've never skied them in a Dynafit (although one of my NTN set ups has a Dynafit heel) word on the street is that they work fine with the block and not so good without it. If I were going to do any significant locked-heel time I'd look into a stiffer boot.