Synthetic Insulation

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Midweight Synthetic Insulated Jackets

Balancing lightness, warmth, weather resistance & breathability, a midweight synthetic jacket is the most versatile of insulation. We've put 11 models head to head in search of the best all-rounders.

Latest Reviews

These are reviews from the UKC editorial team

Rab Cirrus Flex Jacket

This lightweight synthetic duvet is a versatile insulating layer that's well suited to the UK's damp climate, says Charlie Low

Arc'teryx Atom SL Vest

This ultralight insulating layer probably weighs less than half your t-shirts, yet it packs a surprising punch in terms of warmth for weight, says Dan Bailey. Shame the cut is so short!

Patagonia Micro Puff Hoody

Patagonia have something of a reputation when it comes to creating cult classics, and the Nano Puff is one of them. So how does its lighter cousin fare in comparison?

Alpkit Apogee Jacket

Offering plenty of warmth for its modest size, the Apogee is a decent lightweight synthetic belay jacket at a fair price, says Dave Saunders

Rab Women's Photon X Jacket

With plenty of warmth for its weight, this is an excellent belay jacket for low-to-mid grade climbing, says Helen Rennard, though for...

Marmot Featherless Hoody

Featherless is Marmot's entry to synthetic fill that claims to give down a run for its money. How does it fare in the cold and damp of...

Outdoor Research Alpenice Hooded Jacket

Marrying weatherproof fabrics with a snazzy pile lining, this is a bit of a cutting edge softshell, reckons Dan Bailey....

Latest News

These are annoucements direct from manufacturers

Montane Winter Range Overview

Highlights of Montanes Winter Range, including innovative new insulation, shell, and mid-layers.

The North Face Summit L3 Ventrix™ 2.0 Hoodie

Your new alpine workhorse, this synthetic-insulated mid layer features our cutting-edge dynamic-venting insulation that activates with movement, and it has abrasion-resistant fabric in key zones for lightweight durability. It sets a new...

Introducing The Patagonia Micro Puff™ Collection

The Micro Puff™ Collection was created for days when you need one piece of insulation to do it all—for startstop activities in cold climates, when space in your pack is crucial and temperature changes inevitable.

Arc'teryx Atom SL Vest

Minimalist insulation for warmer days - versatile, breathable warmth. Ideal for multitude of active summer pursuits, from rock...

Páramo Men's Ostro & Women's Alize Ultra Light Windproofs

Award-winning, ultralight, water-repellent, highly breathable windproofs from Páramo offer...

New from Rab - The Cirrus Flex

The Cirrus Flex is one of our most versatile jackets to date. Lightweight, warm, and breathable - this synthetic layer is...

Alpkit Apogee Jacket

Tough and toasty Primaloft Gold winter belay jacket for keeping warm when resting, at belay stances, and between those stints of being...

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