The neoprene is no hotter or colder than the stock seat fabric. Definetly nothing like leather. I let them bake in the 90 temp of sun river last week while I played a round of golf, got in and drove off just like it was back home in seattle. Even the leather wrapped steering wheel wasn't hot.
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My Xterra Pics
I wish I would have a real tragic love affair and get so bummed out that I'd just quit my job and become a bum for a few years, because I was thinking about doing that anyway.