These custom dyed training belts by Pioneer are hand dyed using a professional dye in house. They are treated with a conditioner, polish, and sealant to maximize sheen and longevity. They are built using the same 100% Vegetable Tanned Sole Leather that we use on all of our belts. These are what I call the “Sophisticated Belt” on our social media outlets and are an awesome contrast to the embroidered custom belts that we offer. If you are looking for an old school- no frills belt that will last you a lifetime, this is the one for you! The Training Belt version of the Custom Dyed Belts are 8.5mm thick, 4in in the back and taper to 2.5in on the sides and front.