many of the traditional neck braces can be used over the Ergo 365 Pro Expedition without problems, nevertheless the best solution in terms of protection and comfort is to use a Spidi Neck DPS Vest
This airbag vest that Spidi kept developing since over 10 years, provides a neck and spinal support along with the Ergo's stock EN1621-2 Lev.2 back protector and prEN1621-3 chest protector.
It prevents dangerous movements of the neck in event of a crash, without affecting the riding comfort during the ride.
This system is fully restorable, weight only 1,40Kg, and is available both in the vented black edition or the EN 471 High visibility certified version.
Thank for your interest
Matteo De Vito
Spidi Marketing Dept
Vicenza - Italy