No, this product is not at all similar to your Windwall jacket.First of all, let us note that in all fleece jackets there is a tradeoff between breathability and wind-resistance. You either get one or the other, but never both. For example, a windstopper product (such as your Windwall) may be entirely windproof, but it is not very breathable.This fleece is on the opposite end of the spectrum: it is about as breathable as fleeces come, but its wind-resistance is nonexistent. The purpose for such a jacket is that it won't get clammy if you are sweating during a very high-output activity (a Windstopper definitely would get clammy). Instead, it will remain largely dry, lofty, and warm (provided no wind). When wind blocking is needed, this piece must be layered under a shell. This shortcoming is actually a big bonus when layered beneath a shell, because it means (1) opening pitzips will actually have a noticeable effect, and (2) your shell will be capable of breathing to some degree since perspiration moves so readily through the fleece and to the lining layer of the shell.