Mountain Raid 233



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TOG (DRY/WET) 6.3/4.8

The Mountain Raid 233 uses the thicker PrimaLoft® Cross-Core Gold insulation to expand the temperature range of the bag, constructed from a combination of materials to ensure maximum performance. The windproof PointZero shell has a DWR treatment to aid water repellency and PrimaLoft® insulation, which performs even when wet. A half-length zip reduces cold spots and overall weight whilst a close-fitting, adjustable mummy style hood helps trap the maximum of heat. A tapered fit reduces dead air and the shaped footbox makes for a more comfortable sleep position. The Mountain Raid 233 is our warmest sleeping bag yet, perfect for lightweight adventures in the colder months or for the Mountain Marathon competitor looking for a better night’s sleep.

We take this high quality insulation and map different weights per panel to ensure the best usage of the fill. The base sheet is filled with PrimaLoft® Cross-Core Gold 100g/m2, whilst the top layer, above the sleeper, is 133gm/2 (giving us the 233g/m2 total in the name). Mapping the insulation in this way allows us to achieve such a low pack weight, there is no point placing excess wadding (and therefore weight) beneath the sleeper, as the weight of their body will compress it and reduce its ability to trap air and insulate. Instead, we focus the warmth on the top sheet and leave it up to you to decide what mat to use to insulate you from the ground.


By using PrimaLoft® Cross-Core Gold, their highest rated synthetic insulation, we are able to keep weight to a minimum whilst offering our warmest sleeping bag yet.


PrimaLoft® Cross-Core Gold uses 90% recycled content and is more resistant to regular washing and use when compared to down-filled equivalents.


PointZero shell fabric with DWR treatment helps shed moisture whilst the synthetic insulation retains warmth, even when wet; making this the perfect option in challenging and changeable conditions.


Thicker insulation top than base
for maximum efficency
Half YKK zip
DWR (Durable Water Repellancy)
90% PCR (Post Consumer Recycled content)
6.3/4.8 tog (dry/wet)
Stitched through inner with
loose laid outer
Mummy shape
Shaped footbox
Hood drawcord
Fast drying easy care
Hang loops at base
Length: 195cm
Shoulder Width: 65cm
Foot Width: 35cm
Pack Size: 25 x 17cm


Colour: Yellow/Grey
Fabric: PointZero (Nylon), PrimaLoft® Gold 100/133g/m2
Weight: 540g

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What's a Sleep System?

 A Sleep System normally just refers to a usually just a standard insulated sleeping bag but there are some other innovative ideas out there such as our own Rotor Sleep System that uses insulated trousers (that unzip to form a half sleeping bag) that then clip into our insulated jackets and the Foot Pod to complete it. So whilst not technically a sleeping *bag* it is an insulated sleep system!

What Temperature Rating Do Our Bags Get?

 Well…that’s a good question. Whilst we do use the EN tests for the bags, we do not believe these are the best measure of a bag’s performance. Instead we use Tog ratings for both dry & wet performance (very relevant when using them in the UK!). You can find a comparison table for our sleep system on each product page. For more information on Togs, check out the OMM Glossary. We do not assign a temperature rating to our bags as we believe the figures gained in a laboratory are not necessarily representative. Each person will have a different experience, depending on their size, what they have eaten, their metabolism, what sleeping mat they use and what they wear in the bag. Temperatures quoted from lab testing also do not take into account compression of the underside insulation when you are in the bag, which has a big impact on the true value.

Our Sleeping Bags are primarily designed as a race-weight option for our event held in the UK every October. This means competitors can experience anywhere from -5C (as they did in 2018) to plus 10C and often in wet conditions.

The emphasis here is race-weight, that is to say, users are willing to put up with a certain amount of discomfort for the space and weight saving.  

Can I Wash My Sleeping Bag

 Yes! And please do. Just like owning a top end sports car, a performance Sleep System is only as good as how well you care for it. In the same way a sports car still needs oil changes and screen wash, you need to regularly maintain your OMM Sleeping Bag to keep it performing at its best. It is important to follow the Product Care Instructions and use the correct wash  product as these can affect your Bag’s performance. The benefit of using a synthetic insulation is it is much more resilient when washing plus dries a lot quicker. 

What Is A Tog?

 The Tog is a measure of thermal insulance of a unit area, also known as thermal resistance. It is commonly used in the textile industry and often seen quoted for duvets and carpet underlay.
Developed at The Shirley Institute in Manchester, as an alternative to the SI unit of m2K/W.
Basic unit of Tog (insulation coefficient) is the RSI, (1m2⋅K/W). 1 tog = 0.1 RSI: Thermal resistance in togs is equal to 10x the temperature difference (in °C) between 2 surfaces of a material when the flow of heat is equal to one watt per m2. Tog is measured from the difference in temperature between a heated metal plate beneath a fabric and the air temperature above the fabric. This is a much more objective measure than Comfort Ratings, as commonly used for sleeping bags and can be applied to a wider variety of sleep systems. It is also possible to provide a Wet & Dry Tog value, useful when describing use in typical UK conditions.

What Insulation Do We Use?

OMM use PrimaLoft® synthetic insulation as it is widely regarded as the best quality available; with insulating properties very close to that of down plus largely manufactured from post-consumer recycled product (PCR). Usually manufactured in a roll or sheet of ‘wadding’, think loft insulation but a lot nicer! From PrimaLoft® we mainly use their Gold Eco with Cross – Core Technology, their highest rated and most sustainable option plus the latest ACTIVE fabric in the Core Ranges, built from a synthetic plume woven through a knitted mesh, CORE offers the warmth of a fleece but with less than half the weight.

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