The best base layer on the market uses a clever 2-layer construction to keep you dry and warm during any cold weather adventure. Our LIFAA(R) technology wicks away moisture while merino wool creates breathable warmth. LIFAA(R) MERINO 100% Merino wool exterior Flat lock seams for ideal comfort and durability 2-layer construction Non-itch fabric High protective collar Anti-chafe chin guard Raglan sleeves design