Non-myelinated  axons  differs  from myelinated in that they:
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.
Are more excitable
Lack node of Ranvier
Are capable of regeneration
Are not associated with Schwann cells