Golden Grain Premium Cowhide Leather Drivers Ball and Tape Pull Strap for adjustable fit Keystone Thumb - A keystone thumb provides added reinforcement and padding at the point on the glove that receives the most wear. It is a double thickness of leather that overlaps onto the base of the thumb. Turned Leather Binding These gloves are our best Unlined Drivers Gloves. High Quality and Comfortable Fit. Same as our WK-98 but with a pull strap at the wrist.