Eisen put the pieces for the boots together rather quickly, and after he finished that part, all that he needed to do was finish the enchantments on the surface of them. They were just there to enhance and support the enchantments that were placed inbetween the soles and insoles, of course, and were making the sounds that the boots produced close to silent.
Eisen basically did the same again when using Magic Inscription. Basically, the boots didn't make any sound that any normal person could hear now. Raziel still might, though, although Eisen wasn't even sure about that.
Either way, they were now finished, so Eisen could move on to the rest. The leather armor that the male soul wanted didn't really have anything all that special about it itself. It was just basic protection while still allowing for a lot of smooth movements, that was it.