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A light down jacket worn over an ultralight synthetic jacket at a cold camp in the Cairngorms
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From now until sometime
next May an insulated jacket will be in my pack on every hill walk. It’ll be
thick enough to keep me warm when stationary in freezing stormy weather. I may
also be wearing a thinner insulated jacket when walking too. On every camping
trip and in the coldest weather on day walks I’ll carry insulated trousers too.
Such garments are great for comfort and also good for safety. I’ve written many
reviews of insulated garments over the years, You can read some of them, such
as this
one, on The Great Outdoors website. Here is an edited piece I wrote for the
magazine about insulated garments in general.
The basic
choice in insulated clothing is between down and synthetic fills. The latter
have improved noticeably in recent years but despite this down is still warmer
for the weight and more compact when packed. Down is longer lasting too, though
the latest synthetics are pretty durable, and also soft and very comfortable,
moulding to the body for near instant warmth.
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| A light synthetic jacket worn on a damp stormy day |
The big
plus point of synthetics is resistance to moisture. They soak up less water and
dry much quicker than standard down. Hydrophobic down, which has a water
repellent treatment, is more resistant to moisture but still not as good as
synthetics. Nothing is very comfortable when sodden though. In rain down
clothing is generally too warm to wear while moving anyway and you probably
won’t need it at rest stops – if you do getting it on and then pulling a
waterproof over the top can be done quickly (if you plan on doing this make
sure your waterproof jacket is big enough). Also, down clothing usually has a
DWR treatment that keeps rain out for short periods. Whilst getting down clothing
soaked is best avoided a little dampness isn’t a problem. I’ve used down
garments for two-week trips in very humid conditions with wet snow or rain most
days and they’ve stayed dry and kept me warm as they were never directly
exposed to the weather for very long.
New types
of synthetic insulation have made it more comparable with down. Some of these
new insulation materials are made up of loose fibres rather than matts and can
be blown into compartments like down. Garments with these can often be
recognised by the typical stitch lines between compartments, making them look
just like down ones. Synthetic insulation is made from oil. To reduce the
environmental impact of using this some companies have started making
insulation from recycled materials.
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Down jacket on the summit of Ben Macdui
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Down comes from
geese and ducks bred for food. Until a decade or so ago there was little
concern about the conditions in which these birds were kept or how they were
treated. However, investigations by environmental and animal rights
organisations showed that some were force-fed for foie gras while others were
live-plucked, and many were kept in poor conditions. This resulted in many
companies setting standards for down supply.
Garments
fall into two categories. Thick, warm ones designed to be worn at rest stops
and in camp, but which are too warm for walking except in extreme cold and
lighter, thinner ones that can be worn all day in cold weather. The latter are
replacements for a thick fleece or softshell. They can be worn on their own –
most are windproof and water-resistant – or under a shell. Because synthetic
insulation works okay when damp garments can be pulled on over wet waterproofs,
so you don’t lose any heat removing the latter.
FEATURES
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A lightweight down jacket
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Fill
Down and synthetic fills both have
advantages and disadvantages. Down is lighter and more compact for the warmth
and lasts longer if cared for properly. Synthetic insulation performs better
when wet and dries more quickly. Each type comes in different forms.
There are now quite a few synthetic
fills, many of them companies own (these may be the same under different
names). PrimaLoft is the leading brand and there are now several varieties of
this fill alone.
Down quality is measure by fill power, which is how much a given
amount of down will rise or loft when uncompressed. The higher the fill power
the more loft the down has, making high fill power down warmer for the weight.
Some down garments have synthetic insulation at key points for
moisture resistance.
Hydrophobic down resists moisture far better than standard down.
It’s still wise to avoid getting it wet though.
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A light synthetic insulation jacket
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Shell Fabrics
Shells are usually made from tightly woven
nylon or polyester fabrics as these are windproof, breathable and downproof.
They dry fast too and can be quite water-resistant if they have a good DWR
treatment. Pertex is the leading brand but there are similar fabrics. They are
all usually quite thin and so don’t have the tear or abrasion resistance needed
for scrambling or bushwhacking. However, they are mostly quite smooth, so a
shell can be worn over them without it binding and restricting movement.
Waterproof/breathable shells are found on some
insulated garments. They do make them waterproof but also a little bulkier and more
expensive.
Pockets
Insulated hand warmer pockets are very useful
in a warm garment. Jacket pockets that can be accessed while wearing a pack
hipbelt are the best if you plan on walking in a garment. Roomy pockets into
which you can stuff hats and gloves when you’re not wearing them for short
periods are worth having too – ones inside the garment are especially useful
for this as hats and gloves will stay warm.
Hoods
Whilst not essential a warm hood can be very
welcome on a stormy day and replaces the need for a separate hat. Adjustable
hoods are best as these can be tightened to stop them blowing off in strong
winds.
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Down jacket, synthetic insulated trousers & bootees at a very cold Caingorms camp
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Trousers
Full-length
leg zips are useful on insulated trousers so you can easily pull them on over
footwear. However if you carry them for sleeping ones without zips are the most
comfortable.
Weight & bulk
Down garments are very light for the warmth
provided. The heavier ones are suitable for temperatures well below freezing,
the lightest can be carried in summer for cool evenings and combined with other
warm garments in sub-zero temperatures. Synthetic insulated garments are
generally heavier and bulkier for
similar warmth. The thinnest synthetic insulated garments are equivalent in
warmth to heavyweight fleece and can be used as midlayers.
Size
Having the
same size label doesn’t mean that garments are actually the same size as each
other. Some garments are sized to fit closely so if you want to wear them over
a fleece or softshell a size larger than normal is needed. Other garments are
sized to fit over several layers and feel baggy worn over just a base layer.
Sizing isn’t consistent between companies either. I’m a Large in some garments,
a Medium in others.