This hybrid is a great combination of advanced synthetic Hydroloft Polyball insulation keeping heat at the centre of your body, while the cosy knitted fleece arms and sides offer greater freedom for strenuous climbs. Warm yet breathable when the going gets tough, with the added bonus of water resistant fibres to aid weather proofing. When the sun shines, it compresses into a brilliantly packable piece to go wherever the day takes you. For comfort, fluid movement and convenience, this beauty is pretty hard to beat.