X-BIONIC APANI 4.0 Merino R-Neck is a performance base layer that pairs Merino wool comfort with X-BIONIC’s 3D Bionic Sphere thermoregulation for precise temperature control during cold-weather activities. Key attributes: Multicolor | Merino wool | Thermoregulation | Moisture management | Breathable | High insulation | 3D Bionic Sphere® with ThermoSyphon® | Air-Conditioning Channel® | ISO-Shoulder and ISO-Chest zones | Expansion Ribs® at elbows | Low compression fit | Round neckline | Long sleeves | Functional zone knitting | Dimensions & fit: Body fit | Low compression | Composition & care: 87% merino wool | 12% polypropylene | 1% elastane