Puncture resistant 18" tires? I need to replace the 18" cheap Schwalbe iMPAC Streetpac 47-355 tires that came with my Birdy folding bike with puncture resistante tires. I almost never ride on country roads, so thinner tires are fine.

Does someone know of alternatives to the Schwalbe Marathon Plus 35-355?

Thank you.
The Marathon Racer is also available in 18". Won't be as puncture resistant as the Plus, but lighter.

(My (second hand) Birdy is still on the Mad Mike's it came with. My previous folders (20" tyres) used Big Apples, and I didn't have puncture problems, and the Apple is also available in 18", but it's fatter.)