Agree with other posts. Works really well. So nice to not have to swap shields.
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The Shoei Transitions CWR-1 Photochromic Shield w/ Pinlock pins is the perfect accessory for your Shoei Helmet. The Transitions Shield seamlessly adjusts the changing light to deliver the optimal tint level. This solves the age old problem of having to travel with both a clear and tinted shield. Bell has offered a Transitions Shield for their helmets for the past few seasons and they have proven to work well. On the surface this may seem like a lot of money for a replacement shield, trust us when we tell you it is worth EVERY PENNY!
PRODUCT DETAILS AND UV PROTECTION
Transitions adaptive sun wear products have a range of light transmission levels, all optimized for the specific activity the product is designed for. Specifically, the SHOEI Transitions adaptive shield:
SHOEI Transitions adaptive shields are designed to meet International Standards of Performance for driving.
Like all photochromic products, temperature can cause fluctuation in performance. UV rays activate the photochromic molecules through a photochemical process - this makes the shield darken. The fade back reaction is actually driven by heat - so in extremely hot temperatures, the photochromic molecules are actually fading back while they are activating - this prevents the shield from fully darkening. Transitions lens technology is the most advanced in the industry, and is the least temperature sensitive, but there will be some performance variables depending on the temperature.