Confused over mainsail material

Measure your spars, not the sail. Crusader will give to a template telling you what measurements to take.
 
Another vote for vektron , my main now two years old , fantastic , fully battened too , cost same as good quality dacron yet should hold its shape for at least a decade., sets like a race laminate cant recommend it enough.
Oh and lighter than equivalent dacron so makes handling easier

With all due respect
The operative words being " should hold its shape"
Really 2 years is not much of a test unless you have covered as many miles in those 2 years as a typical sailor might in 6 years at least. Without that you have no idea how long it will last.
Some cloths fail miserably in quite a short time span after a certain time. My Doyle( a North owned company I believe) main looked OK ( just) for 2 years then just Carp after that. The jib just looked carp from day 1
 
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