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.