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The two stretchy straps have clips on their ends which hook over the wire springs on the underside of the seat. They can be unhooked with a bit of effort. See video here
To be honest, they are a little too much of a good thing. I like them better than stock because they provide more support under my thighs but they are a little too long for my legs.
One of the first things I noticed when driving my new MYP was the lack of underthigh support when compared with my previous car (Camaro). I bought a front pair of these seat covers from RPM Tesla for $45 each. Hope they do the trick.
I'm guessing you swapped the rear tires onto the front rims. What tire size did you buy for the rear rims? Just curious, apologies for crashing your for sale thread.