Women's Infinity Jacket INK VIOLET DARK SHARK The Women's Infinty Jacket is a super lightweight but very warm down jacket. The Rab® Women's Infinty jacket is the latest example of how our close relationship with our fabric and down suppliers has enabled us to create an amazing lightweight and technical down jacket. Our designers took Pertex® Quantum® GL 10D (which is the lightest incarnation of this ever popular fabric) and filled this with some of the best quality European down we've ever used