With the X-BIONIC® INVENT® 4.0 SHIRT ROUND NECK LONG SLEEVE MEN, you benefit from a significant performance boost right from the first steps. The new 4.0 generation is the first to offer Retina® Ultra-High-Definition quality for unique functional accuracy. The legendary 3D Bionic Sphere® System ensures optimal thermoregulation with proven effectiveness on the chest and back. It cools when you sweat and warms when you are cold. Sweat Traps® prevent sweat run-off and further support the cooling effect. Technologies such as the Air-Conditioning Channel® and the Air Guides® are responsible for temperate ventilation. The stabilizing and balancing ProPrio-Padding, as well as the perfect fit from the Active-Bund® and IDEO-Waistband, enhance the performance-boosting wearing comfort.