This new Henley End-On-End Sweater is quality through & through, manufactured using Merino wool & cotton which is naturally breathable & provides ultimate warmth. Merino wool is from Merino sheep, primarily found in New Zeal&. Wool is a living material that adjusts to your body temperature. When it's warm, moisture & body heat is absorbed by the wool & transported away into the air. When it's cold, warmth is retained in the millions of microscopic air pockets naturally present in Merino wool.