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| oztrail Sleeping Bags
- features & Benefits |
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| Understanding your sleeping
environment - Trust the OZtrail team to keep you warm
and comfortable. |
INSULATION
Quite simply, it is the air cells trapped
by the filling of sleeping bags that provides
the insulation. The smaller and more numerous
the air cells, the more they insulate. For
example, the large volume of air in an air
bed does not do a good job of insulating
you from the cold ground because convection
currents cause the warm and cold air to
circulate inside the air bed. Mountaineers
sleep on ice at 8000mtrs above sea level
using 20mm of closed-cell foam for insulation.
It is the millions of microscopic bubbles
trapped in the closed-cell foam that provides
ultimate insulation.
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INSULATION FROM THE GROUND, BUNK
OR HAMMOCK
When you lie in a sleeping bag you compress
the insulating fibres under you. This means
that the sleeping bag offers minimal insulation
from the ground. To have a good night’s
sleep use an insulating layer like a closed-cell
foam or open-cell foam mattress. You might
find a closed-cell foam mat a little too
firm, and on cold ground the big comfy airbed
a little cold. The happy medium is about
5-10 cms of open-cell foam. Obviously, the
thicker the foam the more comfortable it
will be, but not everyone has the room to
carry a normal mattress with them. |
OUR TEMPERATURE RATINGS*
Our quoted temperature ratings are based
on trials and user feedback. They are intended
to be used as a guide to help with your
decision of what sleeping bag best suits
you. If we think in terms of warm or cold
sleepers, women are generally cold sleepers.
We offer a minimum temperature rating which
would suit ‘warm’ sleepers and
a comfort rating that would suit the average
sleeper.
* Please note that specified temperature
ratings assume that you are insulated from
the cold ground. |
We
have a colour coded temperature rating system: |
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| When
choosing a sleeping bag remember... |
- Women and ‘cold’ sleepers
should choose a bag that is 5 degrees
warmer than the comfort rating.
- Always choose a mattress that will
suit the minimum temperatures you are
expecting.
- You sleep warmer after a good meal.
- After a day of high activity, you may
tend to sleep ‘colder’ than
usual.
- Always choose a bag that is close to
your body size. On a cold night, if the
bag is too big, it will require more energy
to fill with warm air. This is important
if you are a ‘cold’ sleeper.
- We lose over 60% of body heat from
our neck and head. It makes sense that
sleeping bags used in cold temperatures
should have a hood. If not, wear a beanie
to bed.
- All sleeping bags offer a little less
insulation on cool, wet nights. Moisture
gets amongst the fibres and water is not
as good an insulating medium as air.
- If sleeping in the open, ‘wind
chill’ has to be taken into account.
The presence of wind will drop the temperature
dramatically.
- If you need to increase the warmth
of your sleeping bag, never drape a blanket
on top of the bag. This compresses the
fill and actually decreases the warmth.
It is best to wear extra clothes or wrap
yourself in a blanket inside a sleeping
bag. An optional sleeping bag liner offers
extra warmth.
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Camper styles zipped together fully
opened out - Holiday Series only. |
Hooded styles, a left and right
hand zip will zip together. |
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QUESTION
Are two people warmer in a double bag than in separate
single bags? |
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ANSWER
It will definitely be warmer for the “colder”
sleeper; but it comes down to how much room the
two people take up in the double bag. Too much room
means you have to warm up more air in the cavity. |
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| MORE
SLEEPING BAG FEATURES AND BENEFITS >> |
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