Each strap is crafted from Horween's Genuine Shell Cordovan. The shells endure a 6-month tanning process at Horween, the oldest operating tannery in America. Skilled artisans tan, stuff, polish, steep in vegetable liquors, hand curry, and hand shave each piece of shell. Each strap is individually handmade in the USA by expert leather craftsmen. Since each one is handcrafted, each strap has its own unique characteristics from the tanning process and handmade nature of the product. The strap is designed for comfort, style, and is made specially to fit the Field Watch with 20mm lug size and an 18mm 316 stainless steel buckle.