Non-myelinated  axons  differs  from myelinated in that they:
Are more excitable
Lack node of Ranvier
Are capable of regeneration
Are not associated with Schwann cells
Remember, two types of Schwann cell: Myelinating and non­myelinating types.
In the PNS, unmyelinated axons are surrounded by Schwann cells (non­myelinating), whereas myelinated axons are ensheathed by multiple wrapped membranes of Schwann cells, much as the oligodendroglia, that ensheath central axons.