The Women's Alpha Flux Jacket from Rab is a highly breathable, lightly insulated outer or mid-layer that uses Polartec Alpha 'Direct' technology and stretch fleece for on-the-move multi-season use. The Alpha Flux is shelled in a new super-soft yet durable, woven outer fabric which has a high level of air permeability. This is paired with their Thermic-lux light, stretch fleece in strategic areas of the body to allow freedom of movement and to reduce bulk.