Arc'teryx Zeta SL Rain Jacket Review | Switchback Travel,Soft, Stretchy, 'Superlight' Shell: Arc'teryx Gamma SL Hoody Review | GearJunkie,Arc'teryx Atom SL Hood Review | Tested & Rated,Arc'teryx - Atom SL Hoody Men's | Outdoor Gear Exchange,What are your favorite Arc pieces for year round versatility? Pictured, I have my Atom SL for cooler summer conditions, Proton Lt for cooler fall and winter and a beta sl hybrid for year round use. I find these active insulated midlayers the best for moisture