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Crux
Pyro Down Jacket

In Stock Black S
EAN:5060043983727
£125.00
MSRP £250.00
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In Stock Black M
EAN:5060043983710
£125.00
MSRP £250.00
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In Stock Black L
EAN:5060043983703
£125.00
MSRP £250.00
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Sold Out Black XL
EAN:5060043983697
£125.00
MSRP £250.00
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In Stock Red S
EAN:5060043983673
£125.00
MSRP £250.00
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In Stock Red M
EAN:5060043983666
£125.00
MSRP £250.00
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In Stock Red L
EAN:5060043983659
£125.00
MSRP £250.00
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Sold Out Diesel Blue S
EAN:5060043983628
£125.00
MSRP £250.00
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Sold Out Diesel Blue M
EAN:5060043983611
£125.00
MSRP £250.00
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Sold Out Diesel Blue L
EAN:5060043983604
£125.00
MSRP £250.00
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Order now and get it Tuesday 21st by choosing Next Day Delivery
Glossary - Fill power close

Fill power is a measurement used to quantify the ability of down to resist compression, known as its loft. The higher the fill power, the more space the down occupies and the more effective it is as an insulator. Higher fill power down is hard to source and therefore expensive, it does however offer significant weight savings for gram-counting alpinists.

In the outdoor industry fill powers tend to start at around 650 and currently go up to 850 (900 does exist but is rare and mostly needs to be 'handplucked' from live birds). The down's origin is also sometimes given, most 'European' down comes from Hungary and the Ukraine and tends to be better quality that Chinese sourced down. The species may also be given but is not strictly speaking informative. The best goose down will outperform the best duck down, but good duck down will outperform poor goose down.

In addition to the fill power figure, there is sometimes a percentage quoted, eg '85% down' or '85/15 down'. This refers to the ratio of pure down to small feathers used. Higher feather percentages tend to be found on less technical products where down is padded out with feathers which cost less and offer more rigidity to compensate for the lower loft, however almost all products contain some feathers to increase the durability of the down.

International Down and Feather BureauIn the past a number of different competing systems were used to measure fill power. Today almost all outdoor manufacturers use the International Down and Feather Bureau's testing method (sometimes known as the US method). This involves pre-conditioning the down being tested with steam, which gives the best consistency for test results. It is then placed in a cylinder and stirred to maximise its loft, before its volume is measured in cubic inches after being compressed by an ounce weight to give the fill power.

Glossary - Lycra close

Lycra is the brand under which Invista markets spandex in the US, the UK and many other countries (it is also known as elastane and various other names). Spandex fibre was first developed in 1958 as a replacement for natural rubber in corsetry, where its elastic qualities were desirable. Its name is an anagram for 'expands' and it certainly does that, stretching to 7 times its initial length.

Spandex fibres are never used on their own but blended with other fibres to give fabrics stretchy properties. As little as 2% can make a huge difference to the feel of a fabric, adding comfort, fit, shape retention, durability and freedom of movement.

Crux Pyro Lightweight Down Jacket

The Pyro down jacket pushes the envelope in warmth to weight ratio. Its stitch-through baffle construction is stuffed with as much 900 fill goose down as it can take, without needing heavier box wall baffles to maintain loft.

What that means for you is the most warmth you can get in a slim profile down jacket. It will slip neatly under a shell when you're out in the cold, or work well as an outer layer in moderate winter conditions. And when the weather warms up it packs away neatly into its chest pocket.

It beats most of its competitors on weight, it's actually less shiny than the pictures suggest, and at a huge 50% discount, we think this is hands down the best down jacket deal you'll find. 

  • Weight: 315g (M)
  • Two hand warmer pockets with zips
  • External chest pocket that converts into a storage bag (with belt loop)
  • Zip for attachment of optional hood (purchased separately)
  • Lycra binding at waist and wrists
  • Fill:  900 cu.in. (EU) fill power Polish white goose down
  • Fill Weight 150 g (size M)
  • Shell Fabric: 15 denier Pertex Quantum, 29 g/m²
  • Lining Fabric: 15 denier Pertex Quantum, 29 g/m²
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