Adjustable Helix Face Mask - Navy/MultiOffering a high level of protection when worn correctly, this comfortable mask is made from two layers of organic cotton. A flexible nose bridge can be moulded to ensure a good fit and toggles can be adjusted to ensure elastic ear loops fit well. Designed to use in conjunction with HELIX. iso Filters (two included). These can also can be purchased separately. The exceptional electrostatic capabilities of HELIX. iso Filters capture the tiniest