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Synthetic Filled Clothing Products

Special Offer £223.99 (inc Vat)
You save 30%
Outdoor Clothing Synthetic-Filled-Clothing Synergy Featherless Jacket Womens Marmot
Synergy Featherless Jacket Womens

The waterproof Women's Synergy Featherless Jacket is made for tackling epic adventures and tough tracks in unpredictable, cold weather.

Special Offer £223.99 (inc Vat)
You save 30%
Outdoor Clothing Synthetic-Filled-Clothing Synergy Featherless Jacket Marmot
Synergy Featherless Jacket

Waterproof and Warm, what more could you want? The Marmot Synergy Featherless has it all. The GORE-TEX® fabric and PFC-free, water-repellent finish will keep you dry and comfortable even when you wear this insu...

Special Offer £174.99 (inc Vat)
You save 30%
Outdoor Running Running-Clothing Running-Insulation M's Micro Puff Hoody Patagonia
M's Micro Puff Hoody

Super light synthetic filled hoody that gives the warmth for weight of high quality down.

Special Offer £174.99 (inc Vat)
You save 30%
Outdoor Clothing Synthetic-Filled-Clothing W's Micro Puff Hoody Patagonia
W's Micro Puff Hoody

The best warmth for weight of any other Patagonia jacket, the Micro Puff Hoody delivers ultralightweight, water-resistant, down-like warmth with PlumaFill synthetic insulation.

Special Offer £159.99 (inc Vat)
You save 30%
Outdoor Clothing Synthetic-Filled-Clothing Avant Featherless Hoody Marmot
Avant Featherless Hoody

Warm and durable with 100% Nylon PreBaffle Plain Weave Heather outer and recycled featherless insulation is made with 75% recycled loose-fill fibers that feel just as warm as 700 fill power down.

£142.64 (inc Vat)
You save 10%
Outdoor Running Running-Clothing Running-Insulation W's Nano-Air Light Hybrid Jacket Patagonia
W's Nano-Air Light Hybrid Jacket

The Patagonia W's Nano-Air Light Hybrid Jacket takes features from the one of Patagonia's iconic pieces - the Nano-Air and its FullRange Insulation - and combines them with a wicking waffle knit for breathable...

Special Offer £139.99 (inc Vat)
You save 26%
Outdoor Clothing Synthetic-Filled-Clothing Guides Down Hoody Marmot
Guides Down Hoody

Marmot Guides Down Hoody | down jacket sale £139.99

£136.69 (inc Vat)
You save 11%
Outdoor Clothing Synthetic-Filled-Clothing Photon Pants Rab
Photon Pants

The Rab Photon Pant is a synthetic insulated trouser or a great pair of Primaloft Pants. Ideal cold weather clothing for use on Winter Alpine or 6000m mountaineering trips or for emergency use when mountain wal...

£131.04 (inc Vat)
You save 34%
Outdoor Clothing Synthetic-Filled-Clothing Atom LT Hoody Men's Arc'teryx
Atom LT Hoody Men's

Ultimate synthetic jacket for all activities and year round use and an Up and Under staff favourite.

Special Offer £126.00 (inc Vat)
You save 25%
Outdoor Clothing Synthetic-Filled-Clothing W's Nano-Air Light Hoody Patagonia
W's Nano-Air Light Hoody

Women's active insulation in a hooded smock from the Patagonia High Alpine Kit. Using lighter fill than the Nano-Air this piece takes mid layer mountaineering insulation to new heights.

Special Offer £125.99 (inc Vat)
You save 30%
Outdoor Clothing Synthetic-Filled-Clothing Novus Hoody Marmot
Novus Hoody

Breathable synthetic filled jacket which provides insulation, wind resistance, water-repellancy, snow-shedding and breathability in one package.

Special Offer £125.99 (inc Vat)
You save 30%
Outdoor Clothing Synthetic-Filled-Clothing W's Novus Hoody Marmot
W's Novus Hoody

A layer that you'll keep on even while on the go, this hoody is adapted to activity with an AirExchange lining, allowing dynamic air flow.

Synthetic filled clothing fulfills a similar role to down filled clothing, that is as an insulator.

Even in the coldest conditions, your body produces heat, and you feel cold because this heat is removed quickly in a cold environment. The job of insulation layers is to trap air next to the body, allowing your body to warm up this air and then stop losing heat to the environment.

How well the item of cloting does its job depends on a few things; how much air it can trap, how windproof it is (i.e. how much it can stop the trapped air being stripped away by the wind) and how well it does this job if it gets wet.

Synthetic insulation emulates down in that it is made from a tangle of tiny fibres, which trap air and keep warmth in. It is not as good at insulating as down - you will need more synthetic insulation to give the same warmth, but it is getting close! The outer of a synthetic jacket will usually be made of Pertex - a wind resistant, breathable material which stops the warm air in the fibres from being replaced by cold air in a breeze.

Where Synthetic insulation has a big advantage over down is that it doesn't absorb water very well and is quite strong. This means it drys quicky, and doesn't clump together when it becomes wet, unlike down which loses its insulative properties when wet (if the down has clumped, there is nowhere for air to be trapped). For the UK, or anywhere where you are likely to encounter cold, wet conditions, this property of synthetic insulation makes it much more appropriate than down.

If you are heading to altitude and conditions are likely to become so cold that all water is frozen, a synthetic jacket is likely to be too bulky to be practical if it is warm enough and down is a much better choice.

Up and Under OUTDOOR BLOG

Arc'teryx Promotion

In preparation for the forthcoming Autmn/Winter season we are having a temporary Arcteryx sale with clothing on offer between 33 and 43% off RRP and hardwear such as footwear, packs and harnessses at 15% off RRP and free postage on a number of products. Included are products in the Adahy, Aerios, Alpha, Atom, Beta, Fernie, Gamma, Konseal, Mantis, Oriel, Phase, Proton, Sabria, Sigma, Tolu and Zeta ranges.
More on Arc'teryx Promotion »

Lowe Alpine Altus 42:47 Rucksack Review

We've been testing out the new Lowe Alpine Altus 42:47 Rucksack over the last few months, have a read to see how it performed!
More on Lowe Alpine Altus 42:47 Rucksack Review »

Paul Tierney breaks the 214 Peak Wainwright Record

A huge well done to inov-8 ambassador Paul Tierney who has set an incredible new fastest time for summiting all 214 of Alfred Wainwright’s Lake District peaks in one go wearing Inov-8 X-Talon 260 Ultra trail running shoes.
More on Paul Tierney breaks the 214 Peak Wainwright Record »

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