Conquer winter with focused warmth. The X-BIONIC® RADIACTOR 4.0 PANTS 3/4 WMN boost endurance by reflecting your body heat using XITANIT® 2.0 and maintaining insulation with flexible Expansion Ribs®. The 3D Bionic Sphere® System with ThermoSyphon® optimizes sweat management for balanced temperature regulation. Move freely, stay dry, and push harder in extreme cold conditions.