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Sleeping bags
These have been made for the expedition by the French manufacturer,
Lestra-Sport (Amboise). Designed to be used at temperatures in the
order of -40°C, they only weigh 2.6 kg each. The mattress, made
from open-cell foam trapped in a watertight envelope (thermarest)
is built into the bag and constitutes the lower part of it. The bag
is covered with a single layer of synthetic fibre (Du Pont de Nemours,
thermolite extreme, 80 g/m2). The upper part of the bag features top-quality
goose down in 3 partitions. The fabric used is pertex (polyamide 66)
weighing 28 g/m2. A large hood covers the whole bag and enables the
face to be protected entirely, while breathing through a hole in the
side. An internal flap prevents the air exhaled through the mouth
during sleep from spreading through the bag, which naturally limits
the water content inside the bag and so prevents the insulation from
becoming wet and thus gradually losing its insulating capacities.
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