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Differential Fill/Differential Cut
Differential Fill means that the quantity of down in the base is less than the quantity in the top of the sleeping bag. At Cumulus we employ a ratio of top: base = 3:2 (discounting the hood, neck and zip baffles). Hence the base has 40% of the total insulation instead of the 50% it would have if there was no Differential Fill. The compaction of the base restricts loft and reduces its insulation value so the difference in warmth between 40% and 50% is quite insignificant. On the other hand, having 60% in the top gives a big warmth benefit compared with having 50%, since no compaction means that the extra down traps a fully proportionate extra quantity of air and loft is increased by a fifth Differential Cut is a manufacturing technique by which the outer surface of the top side of the sleeping bag is wider than lower (inside) surface. This helps the down to expand outwards from the centrally located body position thus facilitating optimum
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