The most striking feature of the B3 bomber jacket shearling from NY American Jacket is its ability to deliver superior insulation even in the harshest winters. The interior is fully lined with genuine shearling, which not only retains body heat but also ensures breathability, keeping you comfortable throughout the day. The outer layer is typically made from premium cowhide or goatskin leather, giving it a resilient structure that can withstand years of wear. This combination of materials guarantees that you're not just buying a jacket, but an investment in enduring warmth and comfort.