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Some (maybe not all) aspects are: Insulation per weight ratio While your observation "the thicker the warmer" is true in general, there are fleeces that are warmer for the same weight and thicknes...
Answer
Some (maybe not all) aspects are: Insulation per weight ratio While your observation "the thicker the warmer" is true in general, there are fleeces that are warmer for the same weight and thicknes...