Wide calf should be 15.5 in a size 6.0 boot. But, it seems Jayden boots are made wrongly. I ordered a wide calf from The Frye Store online and it measured 14.5 not the 15.5 described in their own website. I sent th back, but I am waiting for a resolution as it is not as described. I had order a regular before from Amazon and at the calf it fits exactly like the allegely wide calf from the frye store. No difference at all. Great quality, but.