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Mammut Trion Men's Insulated 3-in-1 Jacket

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Discount Card Price
Retail Price £220.00Was £198.00

Colour: Space-Whale - £130.00 - Collect Only
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A warm, waterproof double jacket, with a removable inner jacket that's very warm too.

Mammut's Trion 3-in-1 is a two-jacket combination that gives you effective weather protection all year round, as much or as little as you need.

Its outer layer is a totally waterproof 2-layer jacket, with a HH rating of 10,000 so it will keep heavy rain out while still maintaining breathability.

The removable inner jacket is insulated with Fibrefill, so it's a warm lightweight layer that makes for excellent wear in cool, dry conditions.

Both the inner and outer can be worn separately, but when combined they make a very comfortable, super-warm and waterproof barrier against any cold, wet weather.

  • Zip-off hood, stows in the collar
  • 1 Napoleon pocket on outer jacket
  • Pull cord on collar reduces heat loss
  • Long in the body, keeping lower back warm
  • Outer jacket fabric: Laminated 2-layer material with matt structured surface.
  • bluesign® approved


Gender: Mens

Reviews (10)

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  • 5 out of 5
Great value performed well, 14 December 2014
By Oliver (Barnmouth)
Bought in September and have been using it all winter kept me totally dry and warm in the welsh winter weather. The fit is good and not a big boxy fit unlike my last jacket.

  • 5 out of 5
Superbly waterproof and warm, 29 October 2014
By z0rT10ok
Bought this jacket after getting rid of my Rab Latok (due to a waterproofing failure that resulted in a new smartphone having to be purchased.) At the time I didn't really know anything about Mammut and only purchased this because the size was quite large and I wanted to try a three-in-one as opposed to a hard shell. My third or fourth outing was a ten mile hike during which it poured down for a good three hours on and off (mostly on...). This jacket did not leak AT ALL and was warm and toasty for the whole day. I would not hesitate to buy Mammut again based on my experience with this one.

  • 5 out of 5
Mammut Trion, 29 September 2014
By Simon (Leek Staffordshire)
This product is an excellent product

  • 2 out of 5
Average, 21 September 2014
By JackA (United Kingdom)
This jacket has been everywhere with me over the last year and it has been average. In the cold it keeps you very warm and there are no complaints there. And the zip out function is great. However this is a dreadful waterproof jacket. Light rain it can manage. But any kind of continuous downpour and it fails miserably.

  • 3 out of 5
Style before substance, 13 December 2013
By Neil P (Inverness)
Did all the research and set myself a budget, and thought this ticked all the boxes. Indeed, it does look good, and it fits great. But as a waterproof I found it disappointing. The main part of the body is fine, but the arms are a different matter entirely. Got caught in a downpour on two separate occasions. Same outcome on both times. Great for posers.

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At GO Outdoors we offer a wide range of delivery options to suit your needs. You can come into one of our fantastic stores to collect or have your items delivered to you at your convenience.

Please see our delivery page for more information. Restrictions apply. Prices and delivery times may vary for remote or rural parts of the UK. Working days are Monday-Friday, excluding UK Bank Holidays.

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Order by 8pm and get your item delivered to you by 12pm the next working day (Not available for NI, Channel Islands or Highlands)

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International Delivery will take between 7 - 10 days and you are liable for any local duty and/or taxes


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If you receive your order and it is not what you are expecting you can return it back to us within 30 days of receiving the goods for an exchange or refund (including the delivery charge if you return it within 14 days).

You can return your items by using Collect+ or by taking them to any GO Outdoors store (except Hathersage) using your delivery note as proof of purchase.

Unfortunately, orders paid for using PayPal cannot be returned to store and we are currently unable to offer free returns as we offer free delivery over £50 as standard.

See our returns policy for more information.