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1. Down or Synthetic Insulation? Down:Lightweight and highly compressible, ideal for packing.Superior warmth-to-weight ratio.Loses insulation properties when wet unless treated with water-resistant down.More expensive but lasts longer with proper care.Retains warmth even when wet. Synthetic:Retains warmth even when wet.Dries quickly and costs less than down.Bulky and heavier than down.Short …

Rab has slashed weight and volume wherever they can with the Ultrasphere, crafting the definitive sleep mat for when every gram counts. It uses innovative offset air chambers to disrupt the flow of convection currents inside and trap heat, keeping you warm on wild overnights without the need for bulky insulation. Combined with a soft, exceptionally lightweight fabric, its weight-saving constructio …