Temperature Ratings

Garment Combination Temperature Ratings

How Warm is Your FR Outerwear?

The ANSI/ISEA 201 Standard for Classification of Insulating Apparel Used in Cold Work Environments defines temperature rating as, “The coldest environment temperature at which a person can remain thermally neutral while wearing a particular clothing ensemble (neither gaining nor losing heat to the environment) at a specified activity level or metabolic rate.” The temperature rating is reported as a temperature of the environment at a particular work activity level specified in Metabolic Equivalent of Task (MET).

What exactly is MET?

MET stands for “Metabolic Equivalent of Task.” ANSI/ISEA 201 defines 1 MET as, “the amount of heat produced by a man at rest (1 MET = 58 W/m²). As a person’s activity level increases, the amount of metabolic heat produced by the body increases, and less insulation is needed for comfort.

What is Clo Value?

Clo is a measure of thermal insulation capability, for apparel insulation. The higher the clo, the warmer the person will be. 1 clo is the amount of thermal insulation required, for clothing, to be comfortable in a normally ventilated room at 70° F (21° C).

How to Determine a Temperature Rating

The temperature rating of a garment or garment ensemble is determined by testing them using ASTM F2732 Standard Practice for Determining the Temperature Rating for Cold Weather Protective Clothing. The test method measures the heat loss and calculates the temperature rating based on the manikin remaining thermally neutral.

Summary

The ratings for garments are specific to the combination of materials (outer shell, insulation material, inner lining) and garment configuration used in the testing. It is not practical to test every combination and configuration.



Temperature Ratings for Garment Combinations

Insulated Garment Combinations Temperature Ratings
(Moderate Activity Level)
Insulated Hooded Jacket over Insulated Bib
368UT11 over 580UT11
-33°F
Insulated Parka over Insulated Bib
510UT70 over 580UT70
-27°F
Insulated Parka with Insulated Hood over Insulated Bib
510NX60 with 577NX60 over 580NX60
-46°F
Insulated Thinsulate Field Coat over Thinsulate Bib
528UT11 over 588UT11
-35°F
Jacket over Insulated Jacket/Liner with Insulated Hood over Insulated Bib
322UT11, 530UT70, 577UT11 and 580UT11
-44°F
Jacket over Insulated Jacket/Liner with Insulated Hood over Insulated Bib
320NX60, 530NX45, 577NX60 and 580NX60
-48°F
Insulated Coverall with Insulated Hood
590NX60 with 577NX60
-37°F
Insulated Coverall with Insulated Hood
590UT70 with 577UT70
-35°F

Temperature Ratings for Jackets

Insulated Garment Combinations Temperature Ratings
(Moderate Activity Level)
Insulated Hooded Jacket
368UT11
-2°F
Insulated Parka without Hood
510UT70
-2°F
Insulated Parka with Insulated Hood
510NX60 with 577NX60
-11°F
Insulated Thinsulate Field Coat
528UT11
0°F
Jacket over Insulated Jacket/Liner with Insulated Hood
322UT11, 530UT70 and 577UT11
-7°F
Jacket over Insulated Jacket/Liner with Insulated Hood
320NX60, 530NX45 and 577NX60
-6°F

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