I have the Mountain Hardware Quasar neoshell pullover. Also have a Rab eVent shell.
Breathability of the neoshell seems very similar to my Rab eVent shell. (both are very good.) I haven't done any scientific tests, but both neoshell and eVent seem better than g-tex I've used, and are close enough to each other that I really can't tell the difference.
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