Alpamayo Waterproof Jacket

Mountaineering specification, traditional length, lightweight waterproof. Cut to allow easy movement and to accommodate down clothing. Now also available in custom sizes.
For clothing, weight is for size: M. For sleeping bags, weight changes with selected length/width. N.B. there may be some variation in the weights of finished products.
590g / 21oz
Alpamayo Waterproof Jacket

The material feels durable but soft and its ample dimensions made it a pleasure to wear ... Overall, a top notch jacket which does the job excellently.
Mark Dodwell, UILMA Guide.



  • Waterproof HS3 fabric with fully taped seams
  • 2 large chest pockets with fully waterproof YKK Aquaseal zips
  • 1 internal security pocket with key holder
  • Single storm baffle with Velcro closure over a two-way front water-resistant Riri Aquazip
  • Full-length under-baffle
  • Fully adjustable waist cord
  • Adjustment cord at the hem
  • Velcro cuff tabs
  • Grown on hood with stiffened peak
  • Hood: large (for helmet) with size adjuster
  • Hood adjustment cords held in extended cord channels
  • Reflective tape on the hood peak for night location
  • Options:
    • Water-resistant YKK Aquaseal Pit-zips



This jacket is now also available in custom sizesSpecify Body Width, Body Length, and Arm Length independently to order a made-to-measure waterproof jacket. This tailor-made service can cope with sizes from XXXS to XXXL and is ideal if your chest/waist to height and/or arm ratios differ from standard, ready-to-wear patterns. 

The Alpamayo Jacket is made with our HS3 3-layer fabric, lighter, more waterproof and more breathable than ever before. The two-way water-resistant Riri Aqua zip is covered by a storm flap with Velcro closure to give maximum weatherproofing. The wired peak on the hood provides effective protection when closed down with or without a helmet.

With two large chest pockets covered by waterproof YKK Aquaseal zips and good arm-lift this is a deliberately simple piece of kit designed for hassle-free use in action. A lightweight jacket, but one you can take with confidence into extreme situations.

Also available in a lighter 'smock' style.

Please note: If you order a custom-sized version of this jacket it will take longer (approximately 45 days) to be manufactured ready for dispatch. Custom-sized versions of this jacket are not returnable and customer loyalty discount cannot be applied.

Waterproof HS3 outer fabric (weight: 115 gsm)

HS3 is a 3-layer laminate, the new fabric for our Alpamayo shell gear. The old argument that a 2-layer fabric with a separate mesh inner was both more flexible and more breathable than a 3-layer has been overtaken by the performance of current 3-layers such as HS3. This new ripstop fabric also removes the disadvantages of mesh (which snags on velcro and can form an ice-trap in extreme cold) and makes the gear considerably lighter. HS3 is fully waterproof and offers excellent breathability.

YKK AquaSeal® zips

Successfully used for years on dry suits and marine sportswear, these AquaSeal® zips are the only fully waterproof zips we know light enough for clothing. No rain flaps are needed.

Riri Aquazip

These are the best of the water-resistant zips. On raingear storm flaps are still needed, but Aquazips provide an extra line of proofing when driving rain is searching to penetrate your clothing.

"The material feels durable but soft and its ample dimensions made it a pleasure to wear. Its waterproof (and windproof) qualities were first rate and tested to their fullest during a particularly unpleasant spell in the Alps weatherwise. The inside layer also feels like it isn't going to flake away as often happens. The hood is supported by a wire which makes it particularly useful when the going gets wet and windy ... Overall, a top notch jacket which does the job excellently, looks very smart."
Mark Dodwell, UILMA Guide.

"A quick note to say thank you for the incredible kit I purchased from you a few months ago. I have recently returned from a research expedition in Antarctica and used the Alpamayo jacket on numerous occasions during shore landings and when caught in blizzards. It functioned perfectly as part of a multi-layer system and not once did my inner layers get wet - even after being caught in fairly aggressive weather out on the zodiacs. Have attached a picture from Port Charcot."
Dr Nathan Smith, University of Northampton.

"I have just come back from Chile, where I climbed Ojos Del Salado, the highest active volcano in the world (6893m). [I was] wearing an Alpamayo jacket and salopettes ... All the equipment I bought from you worked fantastically well, and I have recommended your gear to anyone who will listen."

"I purchased one of your Alpamayo jackets a couple of years ago. I have been very impressed."