Is 840 denier nylon or 420 denier nylon stronger?
Denier nylon is a unit of measuring the thickness/weight of a
thinly spun fiber. It indicates the material's durability, plus the
fineness of fiber filaments and yarns - both natural and synthetic.
The higher the denier, the thicker the fiber; the lower the denier,
the finer the fiber. per Wiki answer to what is denier.