Available in 25c up to 47c...
http://www.chainreactioncycles.com/mobile/schwalbe-marathon-plus-road-tyre-smart-guard/rp-prod24544
I stand corrected! Still doesn't make it a good idea in 25c...
If you want marathon style tyres but less wooden, get Duranos, I think they do a 'double defence' version, many people recommend them as particularly puncture resistant road tyres.
@hamrack started
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Available in 25c up to 47c...
http://www.chainreactioncycles.com/mobile/schwalbe-marathon-plus-road-tyre-smart-guard/rp-prod24544