Like our Arc’teryx Cassiar jacket, this is a trim fit that doesn’t feel constricting. The “SL” in the name designates this product as super light, and Arc’teryx delivers on that branding with the Cerium SL jacket. Its down insulation comes in at a relatively high fill power (850), but doesn’t feel bulky or particularly thick. Inside the left pocket is a permanently attached stuff sack for this jacket. Stuffed away, it’s about the size of a goggle case and still super light. For comparison’s sake, at 185g, this jacket weighs just slightly more than your iPhone 6 Plus.

Check out the FULL REVIEW for more about why we love this mid layer or click the link at the bottom right to see the next pick.