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Definition [Mens]waterproof jacket

Mens technical mountaineering jacket designed to perform in the harshest conditions. Durable, breathable, full unadulterated storm protection.

Definition [Mens] waterproof jacket black

Definition [Mens] waterproof jacket

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12 years in the making, our fully waterproof and breathable Definition Jacket is engineered to cope with whatever you, the mountains, and the weather can throw at it.

'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 – we love the glove-friendly embedded Cohaesive cord-grips – and 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

The Definition jacket is a fortress, it is designed to face the foulest, wettest, windiest, snowiest, wildest weather. Fully featured and tough as old boots, this is the jacket that will take whatever abuse you want to throw at it, from Scottish winter, alpine climbing to Munro bagging. 

Definition is breathable and waterproof. Its face fabric and backer are manufactured from tough nylon for superb durability. Sandwiched between these is a waterproof / breathable PU/PTFE membrane; the result is the best combination of durability and breathability available in heavier weight 3 layer fabric. It is our most durable jacket yet.

Fit for purpose doesn’t just mean waterproof - it has to fit you! Definition is designed to sit over your other layers, its cut is tuned so that it does not ride up to expose your back or tum when you swing your axes above your head. The hood is large enough to fit over a climbing helmet and deflect spindrift from engulfing your core.

The mountains are a changeable environment and you are not always going to want to be locked down. Definition can be adapted as conditions change or your work rate varies. We have used Cohaesive™ cordlock adjusters where they improve function, inverted vent zips for quick climate control - the vent position also means you can access the pockets on your inner layers without undoing the jacket.

We know you are going to be wearing a rucksack a lot of the time so we have designed the placement of the pocket and vent zips to stay clear of your shoulder straps and hip belt, or climbing harness. 

Fast hood adjustment, wired peak, chest pockets, draft excluders, pit zips for ventilation, internal storm flaps, YKK AquaGuard zips all contribute to the full package.

Definition is destined to become a faithful companion on your epic adventures for years to come.

Key features
  • 3 Year Alpine Bond
  • Helmet compatible hood with wired peak, embedded Cohaesive front adjusters and easy-grab rear adjuster
  • 2-way opening YKK Vislon AquaGuard front zip
  • Internal storm flap with bottom snap and chin guard
  • 2 map sized hand pockets (positioned above harness/ waist belt) with YKK AquaGuard zips
  • 1 external chest pocket with YKK AquaGuard zip
  • 2 core body venting YKK AquaGuard zips, inverted for ease of use
  • Gusseted cuffs with anti-snag Velcro adjustment
  • Embedded Cohesive hem adjusters, accessible from inside hand pockets or at the hem
  • 1 internal YKK zipped chest pocket
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Vital stats

145 gsm 3 layer fabric
Face: 40 D x 90 D Nylon
Backer: 20 D Nylon tricot
Bi-component PU/PTFE membrane
20d nylon tricot
Hydrostatic head: 30,000 mm
MVTR: 20,000 g/sqm/24hrs
100% windproof
YKK Aquaguard zips
Weight (g): S: 485, M: 490, L: 530, XL: 550 , XXL: 580

Origin: China


2016 review

Taking a quick look back at the main goings on through 2016


What makes a waterproof jacket?

Customer Support Hero Ashleigh explains what those long numbers and acronyms mean


Reproofing your waterproof

Look after your kit, taking an iron to your waterproof is the proof in the reproofing


Which Waterproof Jacket

Whether you try to or not, sometimes you just can't avoid the wind and rain! Here's a guide to which jacket will meet your waterproofing needs.


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Mens sizing
Chest (inches) 37" 40" 43" 46" 49"
Waist (inches) 30" 32" 34" 36" 38"

These size charts show the body measurements that an Alpkit garment of a given size is designed to fit. They are not actual garment measurements. 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.

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Free UK Shipping on all orders

Free 2 day delivery to UK addresses is included in all orders so the price you see is the price you pay. Upgrade to next day at the checkout.

Free No hassle 123 Day Returns

Buy with confidence and if you are not happy, change your mind or want a swap for any reason then return it for free and we will exchange or refund no question. The price you see is the price you pay. Just return the kit as you receive it - in its original condition, unused, unworn, with original packaging and fit for resale.


We offer a range of finance options from 0% to 9.9% starting on orders over £500. Please give us a call on 01773 417007 to apply for finance. Our customer support heros will take your order and talk you through the quick and easy application process.

Alpine Bond

If one of our products does not meet your expectations upon delivery or, if it does not live up to the demands placed upon it, please return it within 3 years of purchase for repair, replacement or refund. If the problem is our fault then we will do this to your satisfaction if it’s your fault then we will help out the best we can.


9 Reviews


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Proper Job

A good waterproof is an expensive essential for any mountain walker with prices now eye watering for the best kit. But yet again Alpkit have bucked that trend with a well thought through jacket at a sensible price. At 500g it saves 250g off the jacket it replaces and yet is sturdy and windproof (and well tested in the lakes this December!). At this level good waterproofing and breath-ability is a given as are the layout of pockets. I'm 6'2" and wear an XL. If I wanted a shaped fit I'd probably go for a L but the size up works well over fleeces or jackets. I have a Kabatic to give insulation and the colour co-ordinated combination work brilliantly. The location of pit zips is interesting. Alpkit have moved them lower on the jacket so you dont have to faff under your pack shoulder straps. This means that they no longer ventilate your hot underarm, more the back. We'll see if works in the longer term but is a good example of how this company dont just follow fashion, but are willing to think through technical problems with a fresh eye. At £210, it's a bargain and well worthy of five stars.

Matt S
Great Jacket!

I have used this jacket a few times for skiing since I bought it and I love it! It totally blocks out the wind and is still very breathable. Looking forward to taking it out the Scottish highlands for a bit of mountaineering and climbing in a couple of weeks time. Great job guys! grin

Just awesome

Just used this jacket for a week of winter mountaineering in Scotland, including the wrath of storm Doris. The jacket was outstanding! Excellent breathablity and totally wind proof in what was gusting up to 70mph at times. Love it!


Used this jacket in Chamonix skiing this week and it was fantastic. Completely waterproof and windproof and a great fit. Way better than jackets for twice the price from the famous skiing brands.


I've used this jacket in anger about 20 times in the last couple of months. First for a very wet Scottish winter climbing trip, and then for a scalding ski trip in the French alps. I stayed completely dry through torrential rain, and pleasantly cool in the sun.

The fit is fantastic, more athletically cut than the ME Lahotse jacket (that the Definition can easily compare to). Comfortable for all day mountain slogs, and warm enough for standing around in car parks in the peak district.

My only criticism would be the pit zips. The placement makes them easier to use than the traditional underarm zips. However, because they are not over your hot armpits they didn't feel as effective as those on other jackets.

A superbly designed jacket

The tailored fit allows easy movement and just the right amount of room for layering without feeling baggy or flapping in the wind, the sleeve length is perfect. It doesn't ride up at full stretch and the hood fits fine with or without a helmet. The fabric feels bomb proof, and has kept me totally dry in torrential downpours and hours of drizzle. It has decent breathability to boot. There are lots of ergonomic design features. I trust this jacket to perform well and to keep on performing in UK hills and mountains when other significantly more costly jackets have disappointed me.

Craig O
Excellent Hard Shell

Just come back from a week of walking in Snowdonia, it rained all day every day! This jacket kept me dry throughout and never wetter out. It also survived being caught on barbed wire with no damage to show for it!


Great jacket. But doesn't quite compete against the Mountain Equipment Changabang. Zip in/out snow skirt and a shoulder zip pocket would make it perfect.

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.


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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

Trail Magazine Approved
Trail - waterproofs

Trail Magazine: Definition & Balance Waterproofs

Trail Magazine October 2017 - Trail Magazine