Has the Schwalbe Ultremo replaced the Durano? Complemented it?

What kinds of flats are you getting? Glass? Goatheads? Pinch? Radial Tire Wires? Blackberry Thorns? Tube Failures? Something else? I try to prepare for flats, and get one every few months, but keep them to a minimum with good tires, and watching where I ride.

Do you need super-light tires? What size of tires?

In another topic, someone suggested these Panaracer Flataway tire liners. I have a couple on order, and hopefully will send my nephew off to try some out. He gets goatheads
https://www.ribblecycles.co.uk/panaracer-flataway-each/

There are some really thick tires including the Schwalbe Marathon Plus, Michelin Protek Max and Michelin Protek Cross Max, and the Panaracer Tourguard. Sometimes I think the thick rubber tires just pick up bigger pieces of rubber/damage/etc. But it may be worth it for some riders.