TSER is the universally accepted metric for actual effectiveness of tint.
VK70 has 55% TSER and 94% IR rejection, while K14 has 63% TSER and 82% IR rejection. I've had both on my cars, and I can say that the K14 definitely has better heat rejection than the VK70.
With the VK70, you can still feel the heat of direct sunlight on your skin, which you don't feel with the K14.






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