Harkila All Season Shirt is part of a great two piece base layer set made from 100% Pure new Merino Wool and carries the Woolmark® and is mulesing free. This mens base layer shirt has a high neck and a half zip opening with Raglan sleeves for great comfort. It is lightweight, soft and extremely comfortable to wear keeping you warm all day and night. Available with matching long johns and with a neck tube if required, this insulating shirt is available in a full range of sizes from S-4XL