Z-20 Photochromatic - Prism BlueZamp Z 20 Photochromatic Shield Prism Blue Shade Changing shield, so need to change your shield between races, stays clear in low light and changes to Blue Prism when exposed to UV sunlight. The new Z 20 Photochromatic Shield smoothly transitions from clean prism to blue prism (and vice versa) depending on the amount of sunlight there is. Spare and replacement helmet shields are important to have for the serious racer or track day enthusiast. 3mm
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