The fabric used is treated with a silver-ion treatment, known for its antibacterial properties. It'll fend off unwanted odour throughout the day and leave you feeling fresh and comfortable. Using ODLO's WARM technology, the top bounces your body heat right back to you in chilly weather, but gets ventilation zones to let your skin come up for air too.Crew neck baselayerLong sleevesSeamless ConstructionOdlo Warm TechnologyVentilation zonesOdlo Effect Anti-Odour Control silver-ion treatmentFull Moisture ManagementLaser Precision Cut Design360° motion for maximum freedom of movementHi-Tech Thermo RegulationFabric: 63% Polyester, 33% Polyamide, 4% Elastane