GunFlint II, Extra room can be the difference in staying warm, and our Gunflint II is proof. Our King Toe? technology features a larger toe box, which encourages better circulation or is roomy enough for an extra pair of socks. The upper is made from full-grain, waterproof leather and abrasion-resistant nylon, while our Bulls-Eye? Air Bob Carbon Rubber sole features an aggressive lug pattern for excellent traction and stability.