The Gerbing isn't too bulky, but it is thicker than a t-shirt. The vest seems to be a little less bulky than the liner. (but the liner warms up your arms as well, so there's a tradeoff). There's not a lot of material to it, and it compresses pretty easily. It feels sort of like one of those puffy plastic life vests, the ones that you can squeeze down to nothing, but if left with no pressure they will look bulky? I've never worn it under my 1-piece leathers. It would be awful snug in there with the back protector as well, and I also don't know how I'd get the electric cord out of the zipper. I guess I'd find a way if I needed to, but I very rarely wear my 1-piece when I'm on the street; it's pretty much track-only. I use my Gerbing under a textile jacket.
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