It was not an effective defense against most pistol or rifle rounds (ballistic nylon has been replaced by Kevlar and other, more effective, bullet resistant fabrics for these cases) let alone the heavy 20mm and 30mm autocannons Axis fighters were often armed with.
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The Mk 6 is often mistakenly thought to be made out of Kevlar when in fact it is constructed of "Ballistic Nylon" - nylon fibre.