Gore Bike Wear Men's Air Thermo Half Zip Shirt, Splash Blue/Black, XX-Large 80% POLYESTER, 20% ELASTANE Imported Insulating long sleeve shirt for warmth on dry, cold days. Features a high collar, soft material and a short front-zip. Works perfectly as mid-layer under a running jacket or vest. Slim fit Contrast flat-lock seams Short zip with semi-lock slider and underflap Close fit collar Small key pocket in back Mesh inserts for ventilation under arms