3M's crystalline tint blocks a very significant amount of both IR and UV even when the actual tint isn't very dark. It's a bit thicker than most, and a little harder to install. You have to be certified by 3M to buy and install the stuff. It's got like 200-layers of coating on it. It's the only tint certified by the Cancer Society for blocking UV against potential cancer (most glass does block a good percentage, but this drops it to essentially as close to zero as you'll likely get without being almost opaque). It should help the fabric live longer, too.
2014 i3 BEV, 2021 X5 45e
(The i3 will be sold soon, <17K-miles, interested?)