Protech
Every layer adds its fabric weight over the whole coverage. Twenty-four layers of 200 g fabric are almost five kilograms a square metre.
— kg
Ballistic pack, covers and carrier
Panel areas, layer count, fabric weights and the carrier are the design's. Areal density is the layers times the fabric weight, the figure armour packs are compared by; the pack mass is that over the coverage. Covers are counted as two faces of each panel. Stitching, labels, trauma pads and plates are not included. Fabric per vest is every layer over the coverage plus the cutting allowance. **The protection level comes only from the certified test of the actual pack; this tool weighs a design and does not say what it stops.**
Soft Body Armour Panels: Coverage, Areal Density, Pack & Vest Mass, Fabric per Vest — free, with the formula and a worked example, at Textile School.