A gunn- design and keystone thumb enhance the flexibility of the Boss Gloves 4068L Large Premium Grain Unlined Leather Gloves. Enjoy their firm grip when you're driving or performing tasks. Their shirred elastic wrist delivers a snug and secure fit that also blocks dirt and debris. Premium grain leather. Gunn- design and keystone thumb. Shirred elastic back for secure fit. Reliable and comfortable grip. Mobile, durable, and abrasion-. Available in size large.