Fencing New Zealand has recently announced that the current international rule requiring the use of what is commonly referred to as 'double Velcro strapping' on all masks will be a requirement for all Fencing New Zealand run competitions from now on. The first one of these being the President's Cup on 3/4 July in Christchurch.
More information about this requirement can be found in this publication put out by Fencing New Zealand: https://www.fencing.org.nz/images/FeNZ_Masks_Weapon_Control__Competititon_Requirements_May_2021.pdf
You may also want to read the Leon Paul (equipment manufacturer) publication which addresses the background to this as well as explanation as to what the rules are for their 'contour' and 'tongue' masks. https://www.leonpaul.com/blog/fie-masks-update-faq/
Recognising that many may still have masks that do not meet this requirement, Fencing North has decided that this rule will not apply immediately to all Fencing North run competitions, but it will apply from 1 January 2022.
Having said that, as this is a safety issue, you are strongly encouraged to comply this requirement before 2022.
It is possible to 'retro-fit' existing masks to meet this requirement.