Any suggestions on waterproof + airflow seat covers??

[Allen42]

I have had two Sit-N-Fly covers on my bikes and I was very pleased with them. Not so much as a cushion, but really allows air flow which increases comfort. They don't come in specific bike sizes, but they make ones for large seats. You may have to contact them for a Spyder reference. As far as aesthetics are concerned I couldn't care less what it looks if I am comfortable, but these don't look bad at all.
https://www.sitandfly.com/

Thanks! These look to be strikingly similar to the MicroAir covers. I'll contact them as well.