The North Face Summit Series Women's L4 Jacket is an insulated jacket for battling the cold, wet conditions of the mountain. When it's time to set out for the summit, but the weather is only showing signs of snow, sleet or rain, the 4th in the Summit Series is where you'll reach for warmth. ThermoBall™ insulation mimics down, but has the added ability to insulate when wet. It'll compress down nicely into your pack on warm days, and heat you up on the cold ones. The zippered pockets are still harness compatible and the hood provides toasty warmth to the ears and head. Finished off with clean cuffs, they won't be cumbersome or bulky under an additional layer.