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Mountain Equipment Mens Frostline Jacket Black

Mountain Equipment Mens Frostline Jacket Black

£95.00 £190.00
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The Frostline Jacket from Mountain Equipment is an ultralight, minimalist down jacket. It provides essential extra insulation on fast-paced mountain days, or just when lightweight warmth is a priority.

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Season : Sale

Code : 003252-01004-

Weight : 0KG

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What is the Frostline Jacket?

The Frostline Jacket is a minimalist, low-bulk down jacket with a weather resistant shell that’s been designed to keep you warm on those fast days in the mountains. Its small pack-size makes it a perfect piece to throw in your pack and forget about until you need it, then the warmth it offers is very welcome.

What is the Frostline Jacket made from?

Drilite Loft 20D outer fabric offers good abrasion resistance, as well as wind proofing and high water-resistance, especially when combined with the factory DWR coating to further help repel water. The 20D fabric also keeps the pack size small.

The insulation comes in the form of 116g (Size Large) of Down Codex approved 700 fill power down. This keeps the bulk of the jacket low, but the warmth to weight high. The Frostline is ideally suited as a more active layer, when static for longer periods you may find more layers will be needed in order to keep warm. It is aimed more at the alpinists and trekkers amongst us who need extra warmth and a tiny pack size. The down is spread across the jacket on a baffle by baffle basis to ensure an optimal fit and body-mapped warmth.

What are its features?

The aim with the Frostline was to keep the jacket fairly minimal, prioritising the weight and pack size of the jacket over outright features, but Mountain Equipment still managed to tick a lot of boxes with it.

The elastane bound hood has been designed to fit snug to the head, keeping in valuable warmth and making it perfect to pop on underneath a shell hood or a helmet. The YKK front zip deals with closure and the insulated rear baffle behind the zip keeps out any chance of cold spots. It features two zipped handwarmer pockets, one of which acts as the stuff sack for the jacket, leaving it with twin karabiner carry loops for easy harness/pack attachment. Elastane bound cuffs for a snug fit and an adjustable dual tether hem with drawcords round out the Frostline Jacket’s feature list.

How does the Frostline Jacket fit?

The Frostline Jacket has been aimed as a lightweight outer layer or warm midlayer, meaning it will fit well over a baselayer and possibly another lightweight midlayer, but the fit is fairly trim to keep the insulation as efficient as possible.

Where does it fit in the layering system?

The Frostline lines itself up as a midlayer or lightweight outer, making it versatile enough in the layering system to fit in at a few different points.

  • DRILITE® Loft 20D outer fabric; totally windproof and highly water resistant
  • 116g (Size L) of Pure Down with a minimum content of 90/10 700 fill power
  • Stitched-through narrow baffle construction throughout
  • Optimised down distribution and fill weights using a baffle-by-baffle approach
  • Elastane bound Mountain Hood
  • YKK® moulded centre front zip with insulated rear baffle
  • 2 zipped hand warmer pockets
  • Elastane bound cuffs and adjustable dual tether hem drawcords
  • Packs into hand pocket with twin karabiner carry loops
  • Weight : 350g (Size Large)
  • Lightweight
  • Extremely packable
Care & Advice

How Should Your Insulated Jacket Fit?

Insulated jackets are pedantic little things. Too tight and you'll compress the insulation and limit the warmth capabilities of your brand new jacket, too loose and you'll spend hours warming up the dead space inside the jacket. Getting the correct fit isn't just about aesthetics, it will determine how warm you are. 

The Incorrect Fit

Too loose: A jacket which is too loose will keep you relatively warm, however it will take far longer to do so and will waste large amounts of your precious energy. An insulated jacket works by trapping the natural heat that your body gives off in the fibres of the insulation; this creates a micro-climate inside your jacket, keeping you warm and toasty. If your jacket is too loose, heat will be able to escape through the hem, the sleeves and the neck of the jacket; it's a little like sticking the heating on in your car with the windows cracked open - it will heat up, just incredibly slowly.   

Too tight: A jacket which is too tight is arguably worse than one that is too loose. If your jacket is far too tight, the baffles can compress to a point where the insulation can't loft effectively, limiting the amount of warmth it can trap. Essentially, it won't work! 

The Correct Fit
It's a tricky one to explain, but it's somewhere in the middle. You've first got to consider how many layers you'll tend to wear underneath; will you have just a t-shirt then the jacket, or possibly a baselayer, midlayer and then the jacket? When you've figured out your layers and you've popped your insulated jacket over the top, you shouldn't have any dead space inside. The cuffs and hem should be comfortably sealed around your waist and wrists with room to move. You should be able to lift an arm up above your head without the hem of the jacket lifting more than an inch or so, and the sleeves should be long enough that when carrying out the same motion, they aren't mid-way up your forearm. Your shoulders and chest area should have enough room so that your hands can touch behind your back without feeling restricted. 

Additional Information
Lastly, consider which activites you'll primarily be carrying out while wearing the jacket. Are you primarily using it as a winter climbing piece, or an everyday/dog walking jacket? You'll find that technical climbing jackets tend to feature a shorter cut, while urban and casual jackets feature a longer cut to offer additional warmth with less mobility.

To see examples of what a badly fitting and correctly fitting jacket looks like, click here.

Technical Information
  • DRILITE® Loft 20D outer fabric; totally windproof and highly water resistant
  • 116g (Size L) of Pure Down with a minimum content of 90/10 700 fill power
  • Weight : 350g (Size Large)
Sizing Information

Click here for the manufactures size charts.

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Mountain Equipment Mens Frostline Jacket Black

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Excellent customer service. Really detailed easy to understand product descriptions on the Trekitt website, and gear reviews on the Trekitt YouTube channel made it so easy to choose the right backpack for me.
Emily - May 2020
Amazing service! Very helpful in regards sizing and what most matched my needs, despite this being done over the internet. YouTube videos of products being examined are very useful also. Would definitely use again, very fast and efficient delivery. Brilliant! Highly recommended!
David R - April 2020
Highly recommend. I usually go to the shop in Hereford as staff are alwasy very helpful and knowledgeable. So this was the first time I have purchased online and the service was just as good as the shop.
Grizzy - April 2020


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