If you need a lightweight sleeping bag for summer and the shoulder seasons before and after - this is the bag we recommend. Optimal warmth to weight ratio without compromising on the comfort and weight. 3D shaped sidewalls to maximise inside space and comfort. The Pro Fiber 0 has an anatomically shaped hood, the zip is designed high up from the ground for easy access and preventing cold spots. Extra arm opening for flexibility and ventilation. Neck baffle to prevent heat loss. The closing of the hood is done from the inside of the sleeping bag below the neck baffle. Angled foot box that follows the angle of your feets. Inside pocket to store smaller items.