What Our Gearhead(R) Experts Are Saying: "What I love most about the Casaval Jacket is how it breathes. Whether I'm skinning uphill or climbing in variable weather, it regulates my temp without needing to constantly adjust layers. The venting insulation is a game changer, and the fit is perfect under a shell."Purpose-built for moving through the alpine, the Women's Summit Casaval Hybrid Jacket is a go-to midlayer for technical pursuits in cold conditions. This athlete-tested piece uses VENTRIX stretch synthetic insulation, strategically perforated to vent heat when we're working hard and retain warmth when we slow down. Paired with air-permeable face fabrics and hybrid paneling, it delivers dynamic temperature regulation and unrestricted movement on big missions. Stretch-woven panels at the underarms and hem add flexibility where it counts, while a non-PFC DWR finish sheds light moisture during exposed transitions. Clean-finish cuffs and no shoulder seams help reduce bulk under a pack, and raglan sleeves allow full mobility when we're reaching for tools or poles. Whether we're leading skintracks or making steep ascents, the Casaval is the alpine midlayer we trust to move and breathe with us.