The Black Turtleneck is Sterling Archer’s preferred clothing item when on covert spy missions. He often takes credit for being the first to recognize its use as a tactical garment. During a rant, Sterling nicknames it the "tactle-neck," a clever portmanteau.
Black turtlenecks woven from only the purest Azerbaijani cashmere wool
Whenever on a mission, Sterling always insists on wearing his turtlenecks. If a dangerous aspect of the mission comes up, he will even leave to go get one, as seen in "Skytanic." If he doesn't have the option of putting on a turtleneck, he loses some of his confidence in completing the mission. In "Jeu Monégasque" he said, "I mean come on I've broken into way tougher places, right? I mean not without my turtleneck, but still."