I did some research in to various types of Garage door insulation from, spray foam to Styrofoam, to Foil bubble ...and I came to the conclusion they are almost all alike with in a few degrees of insulation abilities.
Most of these products work great. I purchased the Reach Barrier 3009 product because it seemed the easiest to install at a affordable price. This product keeps my Garage noticeably cooler during the California summer. I use to walk in to my Garage and immediately sweat, but now there is a good 10-15 degree cooler temp difference since installing this insulation.
Like any garage insulation it is designed to insulate...so if you park your car in your insulated Garage after a day of driving it will keep in the heat for a long period of time. In the winter that might be good, nice and warm. Summer time in California boo hot. But the Reach Barrier 3009 is doing its job, its insulating my Garage nicely from the outside heat.
Over all this product works well, it was easy to install. Just measure each of your Garage door panels, height and width, mark it on the insulation, cut...and adhere. I cleaned the inside of my Garage panels before installing it, to help the tape hold the insulation in place.
Be sure to measure each panel individually. I made the mistake by measuring one Garage panel and cutting several insulating panels the same size. For my Garage, the panels had two different sizes, depending on the ones along the track and on the inside. So be sure to be mindful of the track panels vs the inside size panels.
Over all the Reach Barrier 3009 is keeping my garage cool for the summer, so I would recommend this product for your Garage too.
I am excited to test this insulation out this winter!