Heavy Duty Glove with patented designed to maximize comfort and durability. 40% more leather than the D351 for greater longevity, 1.4MM thickness cowhide leather, Patented Double Wedge™ design (Extreme curved finger pattern), Ergonomically constructed to reduce hand fatigue and increase comfort, Winged thumb configuration to decrease material bunching around palm, Shirred back (Elastic stretch band for more secure fit), Purpose placed gussets for longer-lasting wear, Minimized seams to prevent stitching abrasion.