Darrow Industries development study, 2019.
The approach that Tai Yong Medical, Isolay and all the others are using is crude and unsophisticated; what we're discussing here is a method by which the skin of a human being can be altered to resemble organic body armor - that's not to say like the hide of a rhinoceros, despite whatever the advertising campaigns might say.
The process is simple in logistical terms, although to the implantee it's lengthy and I would warrant quite painful; but in the end, no more demanding than the work of a cosmetic surgeon upon a vain patient craving good looks. A mesh of thin layered material is implanted directly below the epidermis; the 'armor' per se is covered in a g-loop coating that bonds directly to tissue without rejection, and once the skin is allowed to heal, it becomes a seamless part of the body. Under point of impact, the implantee's skin will still break and suffer bleeding/lesions, but the new armor layer beneath - a sandwich of carbon nanotubes floating in a shear-thickening gel - will absorb most of the impact. Preventing, as it were, all but the most terminal penetration trauma.