Rab womens arc jacket the womens arc jacket is a lightweight and easily packable stretch waterproof jacket with pared down features for active use in all seasons the pertex shield 3 layer fabric allows stretch as well as offering rain and weather protection minimalist features reduce weight and make it easily packable ideal for when the rain catches you out on a climb this jacket is designed to be worn while climbing with a helmet compatible wired peak hood and harness compatible a li