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Definition [Womens] waterproof mountaineering shell

Alpkit Definition womens stormproof jacket - reef


  • Reef - Alpkit Definition womens stormproof jacket - reef
  • Black - Alpkit Definition womens stormproof jacket - black
  • Blaze - Alpkit Definition womens stormproof jacket - orange

Waterproof mountaineering jacket for the harshest of conditions: impenetrable storm protection, whatever the mountains throw at you

SALE: £189.99 Was: £229.99

1. Colour / Size
Fitting guide
8 10 12 14 16 18
8 10 12 14 16 18
8 10 12 14 16 18

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  • Full Description
  • Features At A Glance
  • Care & Environmental Advice
  • Size Guide
  • Customer Reviews
  • Kudos

Under siege again. Shards of wind-lashed ice and volleys of rain pummel your defences, the jagged rockface above slicing through any remaining resolve. ‘Where are those pristine conditions promised by the long-range forecast?’ Fortifications still standing, you push on...

A fortress of a jacket, the Definition has been designed to safely encase you from the wettest, windiest, and wildest of mountain weather. Fully featured and tough as old boots, the Definition is the ideal jacket for Scottish winter epics, committed alpine climbing and year-round Munro bagging.  

Highly waterproof (30K HH) and breathable (20K MVTR), the Definition will keep you safe and dry, even in savage highland storms. We’ve used a 3-layer construction, providing long-lasting performance and protection from exposure. Whether scrabbling up chimneys or scraping along traverses, the durable nylon outer stands up to the rough abuse of mountain use, and a strong nylon backer protects the PU/PTFE waterproof membrane.   

Designed to sit over multiple layers, the Definition is cut with pre-shaped arms to avoid riding up and exposing your back or tum when you’re reaching up for holds or swinging ice-axes. A large hood is sized to comfortably fit over a climbing helmet, deflecting spindrift from engulfing your core, and the wired peak and three elastic adjusters allow you to really batten down the hatches when the weather rolls in. A two-way YKK Vislon Aquaguard main zip (complete with internal storm-flap) accommodates harnesses, completing the mountaineering-ready feature set. 

Map-sized main pockets have been designed to sit clear of your rucksack straps, hip-belt or climbing harness, as have the innovative vents. The inverted vent-zips are easier to open and close when overheating than traditional pit-zips, giving you easy access your midlayer pockets too. All external zips use YKK Aquagard water-resistant zips and an internal and external chest pocket add secure storage options. Catch-proof hem adjusters are neatly concealed within the main pockets, and gusseted cuffs fit easily under or over gloves, with anti-snag Velcro adjusters. 


'The Definition is arguably as good or better than some jackets costing twice as much. The cut is sleek and efficient, components are top-notch... the unbranded fabric works well and feels reassuringly tough. The effective helmet-compatible hood means you can use it for anything from full-on mountaineering to general hill-walking' - Outdoors Magic 

Key features
  • Reliable 3 layer construction is highly waterproof and breathable (30K HH and 20K MVTR) keeping you dry in the wettest of conditions
  • 40 x 90 denier nylon outer fabric is exceptionally hardwearing for rough mountain use
  • Helmet-compatible hood is fully adjustable (side and rear adjusters) with a stiffened and wire peaked hood to protect the face
  • Water resistant Aquaguard Vislon main zip is protected by an internal storm flap and is two-way to accommodate harnesses
  • Cut to fit easily over multiple layers with pre-shaped arms to avoid riding up when reaching for holds
  • Map-sized main pockets and an external chest pocket with water resistant YKK Aquaguard zips, plus an internal chest pocket
  • Side vents with inverted zips are easy to open, give access to mid layer pockets, and are placed to sit above hip belts and harnesses, as are the main pockets
  • Gusseted cuffs fit easily over or under gloves and are secured with anti-snag Velcro adjusters
  • Hem adjusters are placed within the main pockets to avoid catching
  • 3 Year Alpine Bond
Vital stats

145 gsm 3 layer fabric
Face: 40 D x 90 D Nylon
Backer: 20 D Nylon tricot
Bi-component PU/PTFE membrane


Hydrostatic head: 30,000 mm
Moisture Vapour Transfer Rate: 20,000 g/sqm/24hrs


10: 465 g

Origin: China

Environmental Considerations

We treat all our waterproofs with PFOA-free DWRs, cutting out some pretty nasty chemicals. Unlike our insulation and sleeping bag ranges, our waterproofs are not yet PFC-free. We’re still looking for a PFC-free DWR that’ll provide the same long-lasting performance for waterproofs, but we are working on it!

We make gear you’ll love for longer: gear that lasts; gear you’ll use, repair, re-use and pass onto someone else when you’ve finished with it. That’s why all our products have a three-year Alpine Bond warranty as minimum. We’ve always thought that the most environmentally friendly product we can make is the one that gets used the most and lasts the longest. So that’s what we do - it’s pretty simple really.

Product Care Information

The better you look after this jacket, the better (and longer) it’ll look after you. Well, when we say ‘look after you’... it’s not gonna make you cups of tea or bring you breakfast in bed, but it will keep you nice n’ dry. And the good news is: it’s dead easy to do.

1) After you’ve finished going nice places and doing good things, treat your jacket to a wash at 30°C with either a dedicated Tech Wash (like Grangers and Nikwax) or pure soap. This keeps your jacket breathable by stopping the Durable Water Repellent (DWR) coating from getting clogged up with dirt and skin oils. No one likes a sweaty, clammy jacket.

2) If it’s stopped beading (rain soaking in rather than forming droplets), you can reactivate the factory-applied DWR by sticking it in the tumble drier on a low setting or applying a cool iron to it (under a tea towel).

3) To keep your jacket beading, you’ll probably need to top up the DWR once or twice a year using a Grangers or Nikwax re-proofer. You can find out more about why this is important here.

If you’re still a bit unsure about washing your jacket, you can also take it/send it to our Ambleside store’s waterproof washing service and we’ll sort it all out for you.

Size chart Waterproof Jackets Womens
Women's waterproof jacket sizing chart
8 10 12 14 16 18
Chest (inches) 32" 34" 36" 38" 40" 42"
Waist (inches) 25.5" 27" 29" 31" 33" 35"
Hips (inches) 35" 37" 39" 41" 43" 45"
This size chart indicates the body measurements our garments are designed to fit. Measure yourself as described below, and use the size chart to find your size.
Chest: measure around your chest at the widest part. The tape measure should pass under your arms, and be level from front to back.
Waist: measure around your waist at the narrowest part.
Hips: standing with your feet together, measure around your hips at the widest part.
What You Say: Customer Reviews and Comments

6 Reviews


Used this product?

Write a review
Great jacket

We bought 2 of these for a 6 week tandem tour of NZ. They worked well on a bike even whilst climbing. They withstood the notorious torrential West coast rain for a 3 hour ride. Like the cut. The pockets are great as they take a map. The hood can fit over a helmet which is an added bonus. We chose the orange colour and it helped us be seen by the drivers who travelled at speed past us.

Fantastic jacket

My husband bought me this jacket last month as we are doing a lot of hill walking at weekends and going to be walking up Ben Nevis in September, this is the best jacket I have had in 20 years, got caught in torrential rain last weekend it performed very well, I felt both dry and warm, the wind did not get through and I did not experience the build up of condensation that I have with lesser jackets. love the hood and the fit is great, the scoop covers your bottom nicely to give that extra protection. I wear between a 10 & 12 top and ordered the 12, its a great fit and I can get my lightweight down jacket underneath. i'm so pleased with the quality & service from Alpkit that I have just ordered the definition for my husband.

Very snug!

Beware these jackets are a very "athletic" fit and very snug around the hips. I am a pretty scrawny size 8 with tiddly hips but I had to send back the size 8 I bought. It looked great on, really trim - if I was only wearing a baselayer and a tight Griffon fleece underneath! But the occasions when I require a "stormproof" jacket I also tend to be wearing considerably more layers... If you want to get a thick fleece, insulated top or puffer on beneath, then definitely size up!

Otherwise it seemed very sturdy and with good arm movement. Can't comment on its performance as I had to return it. I loved the bright green "Rocket" colour, hopefully that will be brought back!

Definition Waterproof

I bought the jacket over a year ago after my berghaus paclite jacket finally gave up after 10 years. So far its done 2 winter seasons in the caingorms going mixed climbing and numerous scout weekends and dog walks. It is still 100% waterproof and the fit is really good with space underneath for big fleeces to keep warm. I'm 6'2" so bought a size large and the sleeves are nice and long as is the back length so it doesn't ride up. The material seems to be very tough and has survived ice axe points going in the wrong direction.

It would get 5 stars but I find the pockets go too far down the jacket and so when I put my hipbelt on I need to shuffle everything in them up so they don't get squished. The side vents are a little hard to operate but they don't get covered by your rucksack straps so that evens it out.


Pros: I like the jacket, it is light, functional and easy to wear, good colour and as always great service from Alpkit. Oh and it seems to be dog resistant as one tried to bite my sleeve!
Cons: I am a walker / rider and have trouble keeping the hood down in the wind as the adjusters don't stay put.
I had to go up a size (12) to get this around my hips with my down jacket on (my other Alpkit jacket is a 10) even though it states its designed to go over your kit.
Overall I am happy with the jacket and would recommend it

Simon Kelly
Very disappointed

My wife has had one of these for 8 months or so. She loves the cut and fit BUT after light use over that timeframe the face material is wetting out badly. A gore tex pro jacket that I’ve had for 4 years is still brilliantly repellent. I will have a go at reproofing my wife’s jacket (as I do with other jackets) but our view is that the definition fabric just doesn’t stand up to even moderate use.


Thank you for your honest comments. Our jackets (and many jackets produced within the last year or so) will need reproofing more regularly as the industry moves away from harmful DWR coatings which contain PFOAs / C8 PFCs and above. C8 PFC were fantastically durable but also bioaccumulative in the environment so we now use the less-harmful C6 PFC DWR. How often you reproof depends on how often you use it, but I would expect it to be required at least a couple of times a year, more so with heavy use. You can find more information here: https://www.alpkit.com/spotlight/reproofing-your-waterproof Please drop an email to support if you have any further queries on this.

What They Say: Kudos - Product Reviews from independent magazines and websites

Outdoors Magic Definition Review

Alpkit’s full-on mountaineering shell, the Definition is reassuringly burly but properly refined – think James Bond reincarnated as a waterproof jacket. And the price is fantastic.


Outdoors Magic February 2017 - Jon Doran

OM Reviews 2016/17 New Product

immediately impressive

Outdoors Magic

Outdoors Magic December 2016 -

UKC reviews Definition

Definition screams good design


ukclimbing.com January 2017 - Dave Saunders

Best Value

The Alpkit Definition wins ‘Best Value’ in Trail’s Waterproof Jacket group test.

Ideal jacket if you want practical features at a good price

Graham Thompson

Trail October 2019 - Graham Thompson, Anna Humphries, Tim Butcher

Trail Magazine Approved

Trail Magazine: Definition & Balance Waterproofs

Trail Magazine October 2017 - Trail Magazine

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