2019 Rules are now up. Thanks for the message Jackal!
http://www.asncanada.com/wp-content/uploads/2019/03/2019-ASN-Autoslalom-Regulations.pdf(Copied and pasted from the regs)
4.5 Helmets
4.5.1 Drivers and passengers must wear helmets during all track sessions.
4.5.2 Acceptable helmets:
FIA 8860-2004
FIA 8860-2010
FIA 8859-2015
Snell 2015 SA, or 2015 M
Snell 2010 SA, 2010 SAH, or 2010 M
SFI Foundation 31.1/2015
SFI Foundation 31.1/2010
ECE R22.05 (expiry: ten years after date of manufacture as noted on unaltered,
helmet label)
Snell 2005 SA, or 2005 M (expiry 31.12.2018)
SFI Foundation 31.1/2005 (expiry 31.12.2018)4.5.3 Helmets homologated to Snell M and ECE R22.05 standard are not acceptable
for use in vehicles equipped with roll cages.
4.5.4 Helmets must be in good condition both inside and outside.
4.5.5 It is strongly recommended that helmets be discarded due to deterioration, after
a serious accident or an impact to the helmet.
4.5.6 No helmet may be modified from its specification as manufactured, except in
compliance with instructions approved by the manufacturer. Hardware may be
mounted on a helmet for FIA/SFI approved HANS/FHR devices, provided the
hardware is installed in accordance with recommendations provided by the
manufacturer of the helmet and/or the devices.
4.5.7 Paint can react with helmet shell material and affect its protective capacity,
therefore, where a manufacturer provides guidelines or restrictions on the
painting or decoration of helmets; these must be followed.
4.6 Footwear
All competitors, workers, officials and crew members shall wear appropriate footwear
that fully covers the foot while driving and working on the course. Appropriate footwear
does not include sandals, slippers, open-toed shoes, etc.