What Our Gearhead(R) Experts Are Saying:"The Cirrus Flex is my go-to synthetic layer when I want warmth without overheating. I wear it hiking or under a shell while touring-the fleece side panels dump heat really well, and it packs down into its pocket, which is perfect for tossing in my bag."Whether we're hiking fast on cool spring mornings or adding a midlayer before dropping into shaded terrain, the Cirrus Flex Insulated Jacket from Rab keeps us warm, mobile, and ready for changing conditions. With breathable fleece panels and lightweight synthetic insulation, it's made for active use across seasons. Now updated with larger baffles and high-loft PrimaLoft(R) Silver RISE insulation, the Cirrus Flex balances warmth with packability, ideal for layering under shells or wearing as a standalone in milder temps. Thermic(TM) stretch fleece panels on the sides increase mobility and vent excess heat, while the Pertex(R) Quantum shell adds wind resistance and repels light moisture. Features like articulated sleeves, an adjustable hem, and stuffable hand pocket make it just as technical as it is versatile.