The Arcteryx Sentinel Jacket is a women's big mountain ski jacket leveraging the advanced protection of GORE-TEX. Strong yet comfortable three-layer GORE-TEX is waterproof, windproof, and breathable, and it's enhanced with a flannel lining for light insulation and a cozy feel. With a helmet-compatible StormHood for added coverage in stormy conditions, an integrated powder skirt to keep the cold out, plenty of pocket storage, and zippered underarm vents for rapid ventilation, the Sentinel hardshell jacket is fully equipped for freeride touring (and is just as functional for resort lines, too). Three-layer breathable GORE-TEX blocks wind, rain, and snow Helmet-compatible StormHood for added protection Slide 'n Loc attachment fits compatible pants for seamless coverage Embedded Recco reflector improves searchability in emergency situations Winter 2023/24 product Equipped With GORE-TEX GORE-TEX is an extremely thin membrane that’s durably waterproof, windproof, and breathable. It has over nine billion pores per square inch that are each 20,000 times smaller than a water drop, while being 700 times larger than water vapor. This means that rain won't get through the membrane, but that perspiration vapor can escape through the membrane. Different iterations of this basic membrane principle are used in a variety products throughout the outdoor industry. RECCO RECCO Rescue System is a two-part technology. Ski resorts and mountain rescue teams carry RECCO detectors, which send out a search signal. RECCO reflectors worn in clothing bounce back a directional signal that directs the rescuer straight to the reflector. Unlike other technologies, multiple RECCO reflectors on a person can improve detection.