I just installed the Basenor sun shades for the 2021 Model 3 from Amazon for $50. The 2 shades come in a zippered bag with 12 mounting clips and another bag inside with the reflective screens that you can slip on for the really hot days. In summary, they're a perfect fit and the correct ones have a "2021 MODEL 3" tag on each sun shade. The photos speak for themselves, and the end of the rear shade is curved to help with sightlines through the rear view mirror.
It's important to understand what the shades do and don't do. The roof glass is already tinted and blocks UV and heat, but the glass itself gets hot in the process and radiates heat into the cabin. Adding an aftermarket tint on the roof will not help significantly with heat, but many choose to tint it anyway for a more consistent color when looking from the inside out, especially if you're already tinting between the rear section where the factory transitions from tinted to non-tinted. Likewise, if you use an aftermarket tint on your roof glass, then I would NOT add a sun shade since the clips will scratch the tint. To avoid this, I only tinted the rear half (non-tinted portion) of the roof glass.
What the shade does is help insulate the car's interior from the heat that's radiating from the roof glass, thus reducing interior temperatures and improving passenger comfort. Another benefit of shades is that they cut down significantly the amount of reverberation (echoing) in the cabin, thereby greatly improving the soundstage of your audio system. The more dense the fabric equals the better the shade is able to accomplish both of these things. Of course, this comes at the expense of the amount of light entering the cabin and the "ambiance" / "open air" feeling you get being to look up into the sky. Another disadvantage is that the rear shade sags 1-2 inches from the glass near the headrest, so if headroom is already tight, your passengers will not like the sun shade. Thus, the brand of sun shade you choose, if you choose to use one, should be dependent on which trade-offs you're willing to accept.
It's important to understand what the shades do and don't do. The roof glass is already tinted and blocks UV and heat, but the glass itself gets hot in the process and radiates heat into the cabin. Adding an aftermarket tint on the roof will not help significantly with heat, but many choose to tint it anyway for a more consistent color when looking from the inside out, especially if you're already tinting between the rear section where the factory transitions from tinted to non-tinted. Likewise, if you use an aftermarket tint on your roof glass, then I would NOT add a sun shade since the clips will scratch the tint. To avoid this, I only tinted the rear half (non-tinted portion) of the roof glass.
What the shade does is help insulate the car's interior from the heat that's radiating from the roof glass, thus reducing interior temperatures and improving passenger comfort. Another benefit of shades is that they cut down significantly the amount of reverberation (echoing) in the cabin, thereby greatly improving the soundstage of your audio system. The more dense the fabric equals the better the shade is able to accomplish both of these things. Of course, this comes at the expense of the amount of light entering the cabin and the "ambiance" / "open air" feeling you get being to look up into the sky. Another disadvantage is that the rear shade sags 1-2 inches from the glass near the headrest, so if headroom is already tight, your passengers will not like the sun shade. Thus, the brand of sun shade you choose, if you choose to use one, should be dependent on which trade-offs you're willing to accept.
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