which cold air feed ductiing

[Igorbio]

trying to choose 1 of these (http://www.autosiliconehoses.com/silicone-hose-shop/air-ductings.html)

what is better? 1ply? 2ply? why?

will be used with STD airbox, so the ducting will pass near radiator and cooling pipes and not far away from manifold

[Baz]

2 ply just means it can withstand higher temps, would have thought 1 ply that can withstand 125 degree c would be plenty but if the cost isn't any different or minimal may aswell buy the 2 ply