They have a puncture protection belt of cotton, however,..........i.e. no puncture protection at all
Actually all Veloflex tyres, be that clinchers (Open Tubulars as they like to call them) or tubulars, sport the same puncture protection belt being a callicot cotton weave.
A callicot weave is a very tightly woven pattern stemming from India IIRC.
I used to ride Veloflex clinchers and tubulars and I can't honestly say I flatted more on one or the other. I rarely ever flat but then I can choose where and when to ride.
I have Conti Comp tubs as well and I actually flat them more often than the Veloflexes even though and I do not even ride the Comps half as much as I do the Veloflexes.
I chalk it up to the fact that I'm probably less careful with the Comps than I am with the Veloflexes. Either that or it's just mere luck or lack of it.
IME experience the Comps are in fact less prone to punctures due to city debris (glass shards, bits of steel wire etc.) than Veloflex tyres and that regardless of them being tubs or clinchers.
Statistically there is no difference between the two types of tyres, clinchers or tubulars but I do see two advantages to tubulars as far a puncture resistance goes: pinch flat are pretty much excluded and tubulars are often outfitted with latex inner tubes which can help protect against punctures as well.
As has been pointed out this has been flogged ad nauseam and it inevitably always comes to the same non-conclusive conclusion....
About five years ago we had the same topics pop up every other year or so. Lately it seems the same stuff needs to be rehashed every other fortnight.
Makes you wonder why all these powerful search engines are for.....
For the 1 puncture I get per month when riding intermittently,
That's an awful lot of punctures in such a short period of time or is it a few punctures over an awful lot of miles?