Gorewear Base Layer Thermo Turtleneck - Black Mens XSGorewear Base Layer Thermo Turtleneck Black Mens XS. This turtleneck underlayer is crafted for all weather performance offering a superior next to skin feel from humid rides to the coldest conditions. Its thermo stretch fabric close fit collar and flatlock seams minimize chafing while the short zip with a semi lock slider and underflap allows for adjustable ventilation. Moisture is quickly pulled away from your skin to keep you dry and comfortable on