TheOMM British Army MTP Prototype Thermal Jacket – XXXL
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Military Clothing Size Guide (Click to Expand)
Military clothing sizes are listed as Height / Chest (for jackets and smocks) or Height / Waist (for trousers).
Example: 180/96 fits someone around 5'11" tall with a 38" chest.
| NATO Size (Label) | Approx Height | Chest / Waist (in) | Generic Size |
|---|---|---|---|
| 160 / 88 | 5'3"–5'5" | 34–35" | Small (S) |
| 170 / 88 | 5'7"–5'9" | 34–35" | Small (S) |
| 170 / 96 | 5'7"–5'9" | 37–38" | Medium (M) |
| 180 / 96 | 5'10"–5'11" | 37–38" | Medium (M) |
| 180 / 104 | 5'10"–5'11" | 40–41" | Large (L) |
| 190 / 96 | 6'2" | 37–38" | Medium (M) Tall |
| 190 / 104 | 6'2" | 40–41" | Large (L) Tall |
| 180 / 112 | 5'11" | 43–44" | X-Large (XL) |
| 190 / 112 | 6'2" | 43–44" | X-Large (XL) Tall |
| 200 / 120 | 6'4"+ | 46–48" | 2X-Large (2XL) |
⚙️ Sizing Tips
- The first number is your height in cm.
- The second number is your chest or waist in cm.
- Military gear is usually cut roomy for layering and movement.
- If you’re between sizes, go down for a closer fit or up for layering.
- Example: 5'11" tall with 40" chest → 180/104 (Large).
TheOMM British Army MTP Trial Thermal Jacket – XXXL
Ultra-Lightweight Mountain Engineering | Experimental Military Trial Prototype | Size XXXL
Elite Technical Performance Meets British Military Trials
Secure an incredibly rare piece of high-performance outdoor history. This is a genuine TheOMM (Original Mountain Marathon) Trial Thermal Jacket, manufactured in British Army MTP (Multi-Terrain Pattern) as part of an experimental gear trial program. OMM is world-renowned for building elite, lightweight racing insulation, and this prototype brings that exact mountain-marathon pedigree directly to tactical operations.
Sourced in mint, like-new condition, this jacket delivers a phenomenal warmth-to-weight ratio. Engineered with premium synthetic insulation, it offers super-charged loft and warmth while collapsing down into an incredibly small packing size. For anyone looking for an ultra-reliable, fast-packing cold-weather mid or outer layer in an elusive XXXL size, this is a holy grail find.
📸 "What You See Is What You Get" Listing: This is a strict one-off item. The jacket shown in the product photographs is the exact piece you will receive.
Key Features & Technical Specs
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Genuine OMM Military Prototype: An authentic experimental trial garment combining elite British mountain running technology with military concealment requirements.
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Super Packable Thermal Layer: Loaded with high-performance synthetic insulation that mimics the warmth of down but continues to insulate effectively even if it gets damp in foul weather.
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Ultra-Lightweight Design: Packs down incredibly small, taking up minimal space in your Bergen, daypack, or vehicle emergency kit.
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Elusive Size XXXL: Professionally cut to provide a comfortable, non-restrictive fit for broader frames, easily layering over combat shirts or under field smocks.
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Authentic MTP Camouflage: Finished in the official UK Multi-Terrain Pattern for seamless environmental blending.
Sizing & Condition Profile
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Size: XXXL (Extra Extra Extra Large)
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Condition: Mint / Like New * State: Beautifully preserved with crisp MTP colors, pristine zippers, and original factory loft. Shows no visible signs of field wear or laundering.
Ideal For:
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Militaria & Prototype Collectors: A rare, documented example of high-end commercial outdoor brands prototyping gear for British military evaluation.
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Hikers, Tabbers & Winter Campers: An ideal "summit jacket" or cold-camp layer that provides massive thermal defense without adding weight to your pack.
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Bushcrafters & Survivalists: The ultimate space-saving insulation layer to keep stowed away until the temperature bottoms out.
Domestic Shipping
We mainly use Royal mail 48 for items under 1kg and DPD for items over this weight. We may change this at any time dependant on service availability and destination.
We send out the majority of orders the same day of receiving upto 1pm
We also offer an express shipping service which ensures your delivery is prioritised for delivery as quick as possible and usually delivered the next working day.
We do offer Saturday delivery and timed delivery but prices are on application.
For US and Canada we mainly use Fedex priority and deliveries are usually recieved within 2 to 5 days
For EU deliveries we mainly use DPD by road and usually takes from 3 to 7 days, your parcels are not necessarily delivered by DPD in your county and the parcel may be passed to your countries nominated carrier.
Rest of the World, we have availability with all the major carriers and each is nominated dependant on the best service for the receivers destination.
If you can not get an automated shipping quote please contact us for a spot shipping quote.
If you are not entirely satisfied with your purchase, we're here to help.
You have 7 calendar days to contact us and arrange for the item to be returned which will be received by us no longer than 30 days from initial order. To be eligible for a return, your item must be unused (if applicable) and in the same condition that you received it. Your item must be in the original packaging (if applicable).
There is a £3.99 charge to use our returns facility. (UK domestic only)
To return your item(s) please click here
When sending items back please ensure that the proof of purchase (or copy) is within the package with any instructions if applicable.
Once we receive your item, we will inspect it and notify you that we have received your returned item. We will immediately notify you on the status of your refund or exchange and if applicable we will initiate a refund via your original method of payment.
If you opt for an exchange we will contact you for further postage costs. (price dependant on weight/destination).
If applicable you will receive the credit within 7 days, depending on your card issuer's policies. Contact Us If you have any questions on how to return your item to us.
