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If your tear offs are not allowing the photochromatic to work, it is because the tear off or adhesive is blocking the UV light. Z-Optics Tear Offs do not block UV light, allowing the photochromatic shields to work.
Zamp does not recommend using Racing Optic Perimeter Seal Laminated tear offs on Coated Shield (including ALL Z-20 and Z-24 Prism Shields, Silver, and Iridium). They can have a reaction which can potentially damage the shield or shorten the longevity of the shield. The standard non perimeter seal have no issue.
Z-20 Series shields fit the following helmets: