Product Engineering
A respectable 80% overall can hide one ratio that fails by a factor of twenty. Read the axes, not the total.
— %
100 means fully equivalent on the weighted axes
A weighted score lets a large advantage on one axis mask an outright failure on another, which is exactly the mistake substitution reviews make — treat any ratio far below 1 as a veto to be argued explicitly rather than averaged away. Moisture regain in particular is not a performance dial but a comfort and static behaviour that changes the product category. Four axes also omit everything about dyeing behaviour, thermal resistance, flammability, care labelling and regulatory status, and a substitution that passes here can still fail compliance outright. **Any substitute in certified, protective or regulated product must be re-tested and re-approved, not scored.**
Material Substitution Equivalence Comparator — free, with the formula and a worked example, at Textile School.