Royal Robbins redesigned the classic outdoor sweater, and packed this one with performance features for added breathability and comfort. Open-stitch areas are intentionally placed in key heat zones like the underarms for added ventilation. Combining the natural benefits of non-mulesed Merino wool, like odor resistance and thermoregulation, with quick-drying, durable nylon, this sweater is the perfect layer for adventuring during cool months.