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Why Are Two Thin Blankets Warmer Than One Thick Blanket?

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Two thin layers may provide greater insulation benefit than one thick blanket because they trap more air near your body. Since the two blankets have an air gap between them, they may be better insulators. Body heat warms the air layer between you and lower blanket and also warms the air gap between the two blankets. But many other factors play a role, including the combined weight of the blanket pair compared to the single blanket and the materials of each. All other things being equal, however, the two blankets will probably do better than a single heavier one.

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