You get different laminates, one's Pertex Shield+ 2.5 layer, the other's 3 layer.
I see now that 2m = 20,000mm - water column blah blah.
Just not sure which racer to copy - one has RAB one has Castelli. Both have raced last year's TCR. Both are skinnier than me by 20kg+ :)
@hippy started
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You get different laminates, one's Pertex Shield+ 2.5 layer, the other's 3 layer.