Our innovative range of Goose Down and Synthetic bags, suitable for mountain marathons
to mountain moraine, is the result of extensive research with outdoor enthusiasts.
Our down bags have a unique modular design, making them truly versatile. One bag
will fit securely inside another, providing the option of a higher temperature rating.
Toggle and loop attachments at shoulders and foot secure the bags together to prevent
irritating tangles, and the optional expansion baffle can be added to provide more
space.
The result - maximum versatility across the entire range.
Features at a Glance
Sleeping Bag Construction - Down
Sewn-through construction is used where pack size and weight are paramount.
Box wall construction provides a larger area for down to loft and helps to avoid
the cold spots that can sometimes arise around the stitching in sewn-through construction.
Trapezoidal construction has the benefits of box wall construction but also ensures
a more even distribution of down in the baffles, for increased thermal efficiency
Sleeping Bag Construction - Synthetic Bags
Double layer construction: two layers of fibres with an air gap in between, to provide
additional insulation.
Shingle construction: overlapping layers of fibres which provide additional insulation
and reduce cold spots.
Fabrics and Insulation
fabrics are highly durable, extremely breathable and water repellent. Made from
tightly woven ripstop Nylon yarns, with an extra soft handle, these fabrics have
been created to meet the exacting requirements of outdoor enthusiasts. Our Aurora
Event and Aurora bags use exclusively, reducing weight and keeping packed size exceptionally
small.
offers the same high performance as , but is highly water resistant. An important
requirement for down bags as once damp, down looses its lofting ability and therefore
its warmth. is used on all down bags, from the 3 season Helios -10 upwards, when
damp weather or snow are likely to be encountered.
Down Facts:
Fill power is a measure of lofting and is based on the volume a measured weight
of down will fill. The Lorch method is the current standard for testing loft in
Europe and is the recommended standard of the International Down and Feather Laboratory.
A 30g sample of down is placed in a clear tube and a 94.25g weight is placed over
the down. The height the down maintains give its fill power and can be expressed
as height in mm or volume in cubic inches.
The greater the fill power, the greater the warmth for a given weight of down. At
Terra Nova we use a 775 fill power down, meaning that 30g of that down occupies
775 cubic inches. A larger quantity of down, or the use on alternative will provide
different figures, so it is important to bare this in mind when comparing different
products.
Our down is some of the best available and consists of pure white goose down mixed
in a 95/5% split (95% down 5% feather). The higher the proportion of down, the better
the quality, but a small percentage of feather is essential for wear resistance.
TerraTherm is used in all our synthetic bags, from both Terra Nova and Wild Country
and provides excellent insulating properties for its weight and bulk. A mix of different
diameter, hollow polyester fibre strands are used in both straight and 3-dimensional
structures to create the ideal combination of warmth, lofting and small pack size.
Various constructions are used to achieve the best performance depending on the
end use of a particular sleeping bag.
Independent temperature testing
Terra Nova bags are independently tested to BS4745/ ISO5085-1, 50cm machine. This
provides a tog value which can then be equated to a temperature rating. At first
sight the tog values may seem low when compared to the duvet you use at home; this
is because sleeping bags are more efficient at keeping you warm and therefore a
lower tog rating is required. The temperature rating given is comfort temperature,
if you sleep warm or cold you may want to consider a slightly different rating.
Wild Country sleeping bags have been tested in accordance with BS EN 13537, which
is the new British and European standard for sleeping bags. The standard requires
four temperature results to be displayed, which are as follows:
Upper Limit is the temperature up to which a partially clad standard man
can have a comfortable nights sleep without sweating.
Comfort Rating is the lower limit at which a standard woman can have a comfortable
nights sleep.
Lower Limit is the lowest temperature at which a standard man can have a
comfortable nights sleep.
Extreme Rating is a survival rating for a standard woman. There is a risk
of hypothermia and this temperature should not be approached.
Sensitivity to temperature varies between individuals and depends on a number of
physiological and environmental factors, all of which will influence a persons choice
of sleeping bag
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