The Rab Women's Firewall Alpine Jacket is ideal when the weather forecast is a bit iffy on your summer weekend backpacking and alpine climbing trips. It combines high waterproof, breathability ratings with a thin, lightweight design that's easy to pack, staying convenient whether sunny or stormy. A regular fit lets you layer up the second you feel a raindrop, and articulated sleeves ensure easy mobility up and down the mountain. There are ventilation zippers under each sleeve, and all external zippers feature watertight YKK AquaGuard zippers.