RPM RACING ENTERPRISES is the U.S. distributor for the Hit-Air Neck Airbag System (NAS).
Prices range from $300 for Small & Large (Small is Small/Medium and Large is Large & XL) and $350 for XL (XL is an XXL and XXXL), Co2 Cartridges are $20 ea. S/H $20, Paypal or CC convenience is $15.
Right now I only have XL in stock but will be receiving a new order with S & L sizes in February 2018.
If you are interested in purchasing this device or for more information, please contact Ross at (310) 318-4012 OR firstname.lastname@example.org