In terms of thickness and performance, being the same weight fleece, it's going to be roughly the same. It's a little loose if you size it right, but it's not going to be anywhere near the overall bagginess of the Denali, which is especially huge in the arms. As stand-alone pieces, both are cold when the wind kicks up...like of no use at all. Nylon panels on the Denali add a little abrasion protection, but not so much in the insulation dept. Both pieces work best as a mid-layer under your shell...great insulation in that case, but the fit of the Synchilla under a shell makes it superior in my opinion. Hope this helps.