Cowhide leather is the most common kind of leather. Thanks to the dense texture it shows a high stability and resilience. In general, cowhide leather is so thick that it can be split in two layers. The upper part is named full grain leather, the lower one as cowhide leather or split leather.
Milled leather is dry leather which has tumbled around in a barrel (the so-called mill-barrel) for several hours. This leather is very smooth and has a natural surface structure.