Klim Aggressor 2.0 Long-Sleeve Shirt Men's Undergarment Snow Snowmobile Body Armor - Black / 3X-Large Mechanical Fabric Construction Accelerates Moisture Transfer From Skin To Mid-Layers/Outerwear Thermal Mapping Technology Incorporates Aggressor 1 Fabric In High Heat And Mobility Zones Smooth Surface For Bunch-Free Fit Under Fleeces And Outerwear Low-Profile Flat-Lock Seams Enhances Breathability And Comfort Of Klim Outerwear Systems