Maybe it’s the hood itself that creates a slightly different fit or feel.
My Iron Heart collarless zip is the same weight as my hoodies at 14oz, which is about as heavy weight as I’ve seen.
I like to wear this one under my leather jackets. I believe it was created for riders to layer under a jacket (I could be wrong about that).
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Wearing cotton on a bike is really not the best idea...
It's not warm at all compared to wool, and if it gets wet (sweat or rain) you are going to be even colder.
IMO the whole "designed for riders" is IH marketing.
Not saying that as a bad thing, i wear their jeans everyday, but they love to overplay the "riding gear" thing.