A perfect fit for the ADVANCED SKIN 12 & 5 for women, the SOFT FLASK 500ml/17oz STRAW 28 has been designed to reduce pressure on your chest, while an adjustable straw and high-flow valve make it easier to stay hydrated. Shrinking as you drink to limit water bounce, the flask lets you know exactly how much you have left. Compatible with all Salomon caps featuring a 28mm opening.