This is such a nice, next-to-skin base layer that doesnt irritate you no matter how hard you exert yourself. Patagonia says:A breathable merino technical top, designed to naturally regulate your temperature, control odor and keep you comfortable when you’re working hard in the widest range of conditions. Made from a blend of 65% RWS-certified merino wool and 35% recycled polyester. All of the virgin wool Patagonia sources is certified to the Responsible Wool Standard (RWS) from farm to fiber to help ensure protection both for the animals that supply it and the land they graze. Fair Trade Certified sewn.Our VerdictThis is such a nice, next-to-skin base layer that doesnt irritate you no matter how hard you exert yourself. The merino-polyester blend is soft, supple and durable, with a rapid wicking technology that moves moisture off the skin to keep you dry and comfortable. The polyester helps the t-shirt keep its shape which is often a complaint we hear with 100% merino wool items.The fabric has a little give and stretch to it, so its a good choice for a range of activities, but its a stylish enough piece to be worn away from the hills in your day-to-day life so that you will get a lot of use out of this tee. – Reviewed by Ultralight Outdoor Gear(Unfortunately, we are unable to ship Patagonia products outside of the European Area (defined as the European Economic Area plus Switzerland and the UK))FeaturesSoft, comfortable, next-to-skin blended fabric wicks moisture, dries fast, naturally regulates your temperature and resists odorSet-in sleeves for enhanced movement and fitSide vents with slight drop tailAll of the virgin wool Patagonia sources is certified to the Responsible Wool Standard (RWS) from farm to fiber to help ensure protection both for the animals that supply it and the land they grazeBack-neck yoke with hanger loopWoven P-6 logo at left hemFair Trade Certified sewn, which means the people who made it earned a premium for their labor68% of our fabrics this season are made with recycled materials. Less than 10% of fibers produced globally are made with recycled materials.SpecificationsXSmall (UK 08) weighs: 90gSmall (UK 10) weighs: 95gMedium (UK 12) weighs: 103gLarge (UK 14) weighs: 110gMaterial & Construction3.5-oz 65% RWS-certified merino wool/35% recycled polyester jerseyFabric is certified as bluesign approvedFair Trade Certified sewnAll of the virgin wool Patagonia sources is certified to the Responsible Wool Standard (RWS) from farm to fiber to help ensure protection both for the animals that supply it and the land they grazeHelp & advice:The Ultimate Guide to Lightweight BaselayersThe Benefits of Merino WoolEthically Sourced WoolWhat is Bluesign?Recycled Content in Outdoor Gear

This is such a nice, next-to-skin base layer that doesnt irritate you no matter how hard you exert yourself. Patagonia says:A breathable merino technical top, designed to naturally regulate your temperatur