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Named the best long sleeve base layer by outside online's gear guy, Bob parks. By combining the natural performance characteristics of Merino wool with our bamboo performance technology, we achieve a sum greater than its parts. A fabric that feels exceptional next-to-skin and out-performs both 100% wool and synthetic base layers. tasc Performance base layer is a mid weight versatility layer constructed to a just to unpredictable conditions. It can be worn as a 1st layer in colder climates or by itself in more moderate temperatures.