KETL Mtn No Chill Merino 260 Thermal Base Layer Bottom - VF Series Black Men'sMerino wool warmth that hugs you back. The No Chill Merino Base Layer Top is the kind of piece you forget you are wearing until you realize how comfortable you still are after hours in the cold. The midweight 260gsm merino fabric delivers warmth without bulk while its natural breathability and odor resistance keep it feeling fresh no matter how many days in a row you decide to wear it. Pair it with the No Chill Base Layer Bottoms for a complete cold