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I've had Coolnlite Titan X, Tintsycool and most recent 3m Crystalline film. (All legal specification and VLT, highest spec as im frustrated by the heat) Paying premium for 3m Crystalline which is currently applied. I realised that the 3m front heat is intense and does not seem to deflect the heat as much as my previous. However the car does cool off faster vs the previous 2 brand where I had lesser intense heat while driving but takes longer time to cool off if its been baked in the sun for awhile. Currently crystalline: I can even feel the heat coming in to my hands while driving in a sunny day. Im not sure crystalline is great at deflecting the heat if im feeling this. Is that suppose to work this way where it cools off faster? Can I get bros here help to understand how do we get the proper measurements and what can help me deflect heat as much as possible? When I visited a shop recently they were using 2 different tools with different wavelength to measure the heat. Confuses the heck outa me. 700nm? 9000-1400nm? In short how is heat measured? Is cooling off faster considered a better tint vs something that deflects instant heat but takes longer to cool off? Is heat just measured in IR% rating? and everyone says IR95-99%, some 99% but my skin is telling me its not deflecting heat at all.

Hi All, Have shortlisted the above. Zen is half the price of the other 3 brands (3M, Coolnlite, Vkool) though but not sure if it performs as well. Any recommendations? Thanks.