Neopreme seat covers are not only a waste of $$$, they are a short-lived waste of $$$. First, neopreme is not, despite what some of the ads say, waterproof. If it rains with your top down & you don't get the seats wiped off right away, the water will soak into the neopreme & you'll either have to drive home sitting on a towel or you'll suffer a "Wet Okole".
Next, the colored nylon covers on them fade quickly & unevenly if they see much sun. Red turns pink, black turns purple, etc. After not much time, neopreme seat covers start looking like crap. They wrinkle and the nylon "skin" starts balling & shredding.
I wouldn't run neopreme seat covers if they were given to me.