Keith Bryan Johnson wrote an answer about Arc'teryx Venta AR Softshell Jacket - Men's on February 2, 2009
if you're deciding between these two, the Gamma AR will be much better as a layering piece. You should look at the Hercules, though, which is ideal as a layer, and a medium protection outer softshell.Edit (Jersey Hiker):Keep in mind that an underlayer with a smooth face fabric (hercules, Tau or Rho ar) will slide smoothly under the Scorpion. Regular fleece layers tend to bindPersonally, I would steer clear of any jacket with a wind membrane as an underlayer for a waterproof shell - it's unnecessary and can kill the breathability. In my opinion, the Hercules could be overkill since you already have some insulation on the Scorpion, but if you run cold then maybe that's ok with you. I would go with a more conventional fleece with an open face fabric.I agree 100% with the previous answer. I have the Scorpion and use the Rho with it or Ether Comp jersey.