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Heat Factor 1 products are lightweight, uninsulated and designed to offer the coverage you need without adding unwanted bulk. Many Heat Factor 2 products contain at least 40 grams of 3M Thinsulate Insulation, and many offer the added benefit of an Odor-X Antimicrobial lining. Heat Factor 3 products contain at least 80 grams of 3M Thinsulate Insulation, and many offer the added benefit of an Odor-X Antimicrobial lining.







