Valachio

https://www.rmleathersupply.com/products/buttero-veg-tanned-leather-3oz-made-in-italy

What is the average thickness of a whole cowhide before they split it into 2 parts (top grain and split)? I heard it is around 4mm, is that right? And what is the average thickness of the top grain and split portion? I know the top grain section is usually 1.2mm, so that means the split section would be around 2.8mm right? Thanks.

Thanks for your response Brian. By finishing the edges you mean burnish it right? Also which method is more durable, finishing off the sides or folding the sides? Thanks.

I am looking to make some leather watch straps. I will use full grain calf leather for the outer layer, but I am not exactly sure what to use for the inner layer. The common material used for the inner layer is usually nubuck for its velvet-like surface which is comfortable on the wrist, however I'm looking to experiment with some other possibilities. I also do not want to use any interlining if possible. Perhaps I can use sheep leather? I heard it is softer and generally more comfortable than calf leather. Suggestions needed!