Exposure-response data a r e presented which define t h e protection against thermal energy afforded t o the skin of Chester 'White pigs by cert a i n one-and-two layer f a b r i c combinations. A dimensionless number, c a l led the protective index, i s proposed as a quantitative measure of t h i s protection. It i s defined as the r a t i o between t h e 2-plus median effect i v e exposure under fabric and the 2-plus median e f f e c t i v e exposure f o r bare skin a t the same exposure

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... P. I. = 2+ EE50 sub-fabric 2+ E E p of bare skin For t h e systems studied t h i s r a t i o varies from 1.38 t o 11.1. i