I found the styles of Shaks to fit differently from each other also. I wear medium in the full zips, but found the half-zip to be quite a bit tighter in medium. I ended up with a large in the hooded shak (it is kind of big, but I like it much better than the medium fit). I didn't like the fit of the half zip and returned it.
I have 4 full zip Shaks, and 2 of them fit much tighter than the other 2. This is before being washed.



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The fabric is the same density throughout (cups and straps), but I don't know what to compare it to. Considerably thinner than the Ibex Zepher T's, maybe just a touch heavier than my microweight SmartWool. It's more supportive than I thought it would be, but it wouldn't be enough for anything high impact. Certainly plenty supportive for hiking, cycling on bumpy roads, etc.

