Sort by

Synthetic Filled Clothing Products

£222.83 (inc Vat)
You save 10%
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.

£200.70 (inc Vat)
You save 10%
Outdoor Clothing Synthetic-Filled-Clothing Proton AR Hoody Men's Arc'teryx
Proton AR Hoody Men's

All Round, warm air-permeable soft-shell insulation that self-regulates to prevent overheating, ideal for rock, ice and alpine climbing.

£200.70 (inc Vat)
You save 10%
Outdoor Clothing Synthetic-Filled-Clothing Proton AR Hoody Women's Arc'teryx
Proton AR Hoody Women's

All Round, warm air-permeable soft-shell insulation that self-regulates to prevent overheating, ideal for rock, ice and alpine climbing.

£171.82 (inc Vat)
You save 9%
Outdoor Clothing Synthetic-Filled-Clothing W's Nano-Air Hoody Patagonia
W's Nano-Air Hoody

Women's air-permeable synthetic insulation hoody with stretch and comfort as well as versatile functionality at its core.

£161.82 (inc Vat)
You save 10%
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.

£160.48 (inc Vat)
You save 10%
Outdoor Running Running-Clothing Running-Insulation M's Nano-Air Light Hybrid Hoody Patagonia
M's Nano-Air Light Hybrid Hoody

The Patagonia M'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 £149.99 (inc Vat)
You save 21%
Outdoor Clothing Synthetic-Filled-Clothing M's Nano-Air Hoody Patagonia
M's Nano-Air Hoody

Patagonia M's Nano- Air Hoody is a light, warm, breathable, comfortable insulation piece, perfect for mountaineering, alpine climbing, hiking and other outdoor activities

£142.91 (inc Vat)
You save 10%
Outdoor Running Running-Clothing Running-Insulation M's Nano-Air Light Hybrid Jacket Patagonia
M's Nano-Air Light Hybrid Jacket

Active insulation that will keep some wind and moisture off yet breathes well, weighs little and packs small. Designed for constantly on the go active athletes and for cool-weather fast and light missions.

£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...

£134.87 (inc Vat)
You save 12%
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...

£130.52 (inc Vat)
You save 12%
Outdoor Clothing Synthetic-Filled-Clothing Nimbus Jacket Rab
Nimbus Jacket

An essential for adventure! The Nimbus jacket is a water resistant synthetic down! Compressible and stylish this jacket can take you from mountain peak to the office without looking out of place.

£130.52 (inc Vat)
You save 12%
Outdoor Clothing Synthetic-Filled-Clothing Nimbus Jacket Women's Rab
Nimbus Jacket Women's

Nicely fitted, similar to the Microlight alpine jacket in cut and feel...BUT it can take a shower and still keep you warm and dry!! From the Mountain peaks to the school run, keeps you out having fun!

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

Running, Walking and Crawling with Ben Wernick 2018

Keen trail runner Ben Wernick has run three ultra races with Run, Walk, Crawl to help raise money for a cause that's close to his heart...
More on Running, Walking and Crawling with Ben Wernick 2018 »

Walking The Brecon Beacons Buy and Talk Day

We are delighted to invite all members of Walking the Brecon Beacons Facebook group on May 3rd to a jam-packed day full of talks from Up and Under staff and WTBB guru and renowned International Mountain Leader, Alan Ward. If that's not enough to "peak" your interested - see what I did there - from 12-8pm you can benefit from special discounts and get the opportunity to quiz Alan after 2pm on anything from trekking and travelling through countries such as Nepal, India, Morocco, Indonesia, Peru, Chile and China, to Mountain Training and National Navigation Award Scheme training courses.
More on Walking The Brecon Beacons Buy and Talk Day »

Pembrokeshire Coastal Ultra Races

Up and Under are proud to be involved with the 3 Pembrokeshire Coastal Ultra Races in May 2018. Run Britains only Coastal National Trail the Pembrokeshire Coastal Path as a 180m 5 day race. Alternatively run a 100 mile section either in one go or as a 3 day event. Long cut off times mean these events suit runners and long distance walkers alike and are super friendly and serious fun.
More on Pembrokeshire Coastal Ultra Races »

Please wait!