Motorcycle seat... Vinyl or nauga would be fine.
It's a small job... I just want to keep the water out.
If this is a replacement seat and you don't want anything special....I'd go online to get the one that you want(leather)
If you go with vinyl it will get HOT and the material gets soft in the sun, no matter how cold it is....if it's really hot outside, your gonna get 3rd degree burns on your a$$
Naugahide isn't strong enough to take the "wear and tear" of being a motorcycle seat....in about a month or so it will start to rip and you have defeated the purpose