Measure your chest at the widest point, and your waist at the narrowest point (when you bend to the side, the crease that forms between your bellybutton and ribcage is your waistline).
Measure over your undergarments only.
When choosing your size, go by your largest measurement and select the size that corresponds to that.
All measurements are in cm
You save: 45% ($9.00 NZD)
The HELIX.iso™ replacement pack (filters 80% of particles down to 0.3 microns in size) are available for individual purchase or as part of the bundle. Please see the information and detailed specifications on these filters here. Dispatched in a sealed plastic bag. These filters are designed to be worn in conjunction with the masks sold on our website or your own home-made mask