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Parked in direct sun turns a windshield or side window into a heat lamp aimed straight at your dash and interior. This reflective cover uses a bubble-foil layer to bounce sunlight back out, so the cab or living space stays noticeably cooler and your upholstery gets a break from UV exposure.
Keep it in the door pocket or a storage bin and put it up any time you're parked in full sun for a while — it's an easy habit that keeps the interior comfortable and protects your dash and seating from fading.