Below the ankle the boots are structurally the same: same leather (although the Evo has some extra rubber), same sole, same locking speed lace. The ankle collar on the Evo is taller (3 pairs of speed hooks instead of 2) and for me was more comfortable. The "regular" bit into the bottom of my shins while walking, the Evos don't. One last thing, there is no front crampon notch on either of these boots, if you want to use BD Sabretooth crampons, you'll need the "clip" version, the boots are not compatible with the "pro" version.

NOT TRUE....Evo has a half shank not 3/4 shank.

Steve Tibbitts answered "There are a few differences. First off the EVO is a heavier duty boot made for more of a range from heavy backpacking, glacier travel to mountaineering. It does have a little bit more advanced lacing system with a locking mechanism. The sole is just a little grippier on the EVO for ice or glacier travel. Also the EVO has a 3/4 shank where the other has just a 1/2 shank. One thing I do like better about the regular glaciers is that they are using Perwanger leather which I'm a huge fan of. Both are great boots. Just a little different in a few areas.Hope that helps." For Rainier in July, I'd think the EVO would be best.