ALL-SEASON NATURAL MERINO WOOL The new PURSUIT™ is constructed with nature’s technical fiber Merino Wool and upgraded with a reinforced heel and toe to maximize durability. The four-season fiber of Merino Wool provides warmth in the winter and cooling in the summer, as well as absorbs moisture without feeling soggy or losing the ability to regulate temperature. The PURSUIT™ is engineered with fine-gauge Merino Wool that produces a soft, no-itch feel from cuff to toe. Merino Wool is a naturally renewable resource and is sustainably sourced. The One cuff height rises just above the ankle for additional support and protection in running shoes with a higher back.