The 3D Bionic Sphere System with ThermoSyphon technology maintains the perfect body temperature of 37°C in every situation to ensure optimal performance at all times. Only with X-BIONIC 4.0: Innovative Retina Ultra-High-Resolution, award-winning, patented 3D Bionic Sphere System with ThermoSyphon technology. Featuring complex 3D structures of inner and outer air channels. It cools when you sweat and warms when you are cold. Unique comfort for explorers carrying backpacks. The three-dimensional, woven AirDuct pads are positioned where the backpack straps come into contact with the body. Your shoulders are protected from pressure and friction by the AirDuct Shoulder Pads. Your body is surrounded by the ventilation system Air-Conditioning Channel®, which continuously dissipates moisture and heat. 100% pure Swiss development. Made in Italy. 700+ international awards and test victories, 800+ patent applications for products with the "X".