Mammut Mens Rime Light IN Flex Hooded Jacket Black

Mammut Mens Rime Light IN Flex Hooded Jacket Black

£153.00 £180.00
15% off

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Other colours available:
Mammut Mens Rime Light IN Flex Hooded Jacket Black
Mammut Mens Rime Light IN Flex Hooded Jacket Gentian

The Rime Light is a super versatile insulated jacket which can either be worn as a comfortable midlayer or breathable outer layer. Trust us, when you put this jacket on, you won't want to take it off. 


Season : 2020S C

Code : 1013-00840-0001-

Weight : 0KG

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What is the Rime Light IN Flex?

A quick explanation of the name before we begin; Mammut already produce the Rime, this is a lighter version of that jacket which makes it perfect for use as either a midlayer or outer layer. IN stands for insulated, while the flex part relates to how stretchy and comfortable the outer fabric is. Trust us, when you put this jacket on, you won't want to take it off — it's as comfortable as an everyday hoody yet technical enough for alpine climbing. 

What is it made of?

Outer fabric: The outer fabric used is Quantum Air, courtesy of Pertex. Quantum Air is designed to offer far higher levels of breathability than your traditional outer fabric by allowing a small amount of wind to pass through, constantly replacing a bit of the warm air inside the jacket with cooler air from outside. When you're working hard, this massively increases breathability, yet still offers good water resistance and durability. Due to the fantastic breathability, the Rime can be used as a midlayer with a shell over the top. As if this wasn't enough, polyester fleece side panels increase breathability even further and give the Rime added stretch for active use.

Insulation: Mammut's own Ajungilak OTI Stretch insulation is used throughout the jacket. As the name gives away, this is a stretchy insulation which perfectly compliments the stretchy outer fabric. Ajungilak is fully synthetic, so if it happens to get wet, it'll still provide warmth and protection. 

Inner fabric: Finally, a lightweight nylon is used for the inner fabric, sliding easily over other layers and providing a soft surface for your skin to sit against if you're just wearing a baselayer.

What are the features?

You've got two front pockets which sit above the hips to avoid getting in the way of a harness or rucksack hipbelt, an elasticated hem and cuffs to trap warmth inside and a helmet-compatible hood which can be adjusted vertically and horizontally. The drawcords on the hood are large enough that they're easily adjustable with bulky gloves or mittens on. 

A clever feature of a lot of Mammut jackets is their Easy Combine system. The jacket features loops in various places so you can attach an outer layer to the Rime, making it an all-in-one. 

How does it fit?

The Rime features an athletic fit, and from experience fits more snugly than your average insulated jacket. If you're unsure of your size, use the sizing chart in 'sizing information' below. 

Where does it fit in the layering system?

It can either be used as a midlayer with a shell over the top or an outer layer when the weather is on your side or when you need maximum breathability.

  • 2 front zipped pockets
  • Can be stored in front left pocket
  • Elastic hem and cuffs
  • Helmet-compatible hood
  • Easy Combine compatible
  • Pertex Air outer fabric
  • Elastic lining
  • Ajungilak insulation
  • Fleece side panels
  • Athletic fit
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

Outer fabric: Pertex Quantum Air 40g/m2 / Pontetorto Technostretch 

Insulation: Ajungilak OTI Stretch

Inner fabric: Nylon

Sizing Information

Mammut Men's Jackets & Shirts Sizing Information

Measurements refer to body size, not garment dimensions.

  Chest Waist Hip
Small 34 - 37" 28 - 31.5" 33.5 - 36.5"
Medium 37.5 - 40" 32 - 34.5" 37 - 39.5"
Large 40.5 - 43" 35 - 37.5" 40 - 43"
X-Large 44 - 46.5" 38 - 41.5" 43.5 - 46"
XX-Large 47 - 49.5" 42 - 44.5" 46.5 - 49"
  Chest Waist Hip
Small 87 - 94cm 73 - 80cm 86 - 93cm
Medium 95 - 102cm 81 - 88cm 94 - 101cm
Large 103 - 110cm 89 - 96cm 102 - 109cm
X-Large 111 - 118cm 97 - 105cm 110 - 117cm
XX-Large 119 - 126cm 106 - 114cm 118 - 125cm

Slim Fit: A very close fit around the upper body and arms, body-hugging, very elastic/stretchable materials.

Athletic Fit: Dynamic cut, defined body shape, pre-shaped sleeves, elastic/stretchable materials.

Regular Fit: A close, athletic cut, with little tailoring, comfortable, some elastic/stretchable materials.

Loose Fit: A wide, and in some places longer, cut on the upper body and arms, for a casual and comfortable fit, made from stretch materials.


Measure around your chest/bust, holding the measuring tape under your armpit.


Measure around your waist at the narrowest part.


Measure around your hips at the widest part.


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Mammut Mens Rime Light IN Flex Hooded 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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