Tunnel Trekking Tent - 3 person - MT900 Ultralight


Designed and developed in the French Alps, this 3 person, 3 season tunnel tent is ultra lightweight and compact with minimalist comfort.

With its extremely compact tunnel structure, it offers a small, essential living space. It has 2 doors, 1 large front porch, 3 pockets and tent poles with sleeves for quick pitching and dismantling.


Home delivery or Click & Collect
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Product benefits

Easy transport

Total weight 2.3 kg Compact & compressible bag 8 L Dimensions 40 x 17 x 16 cm


Water column (Schmerber): Flysheet > 2000 mm. Bedroom groundsheet > 3,000 mm

Wind resistance

Resists 70 km/h (Force 8) winds: Tested against gusts on a rotating platform

Easy assembly / dismantling

Quick pitching: pre-assembled room and flysheet. Sleeves for the tent poles


Flysheet can be rolled up for ventilation.Doors & bedroom with mosquito screens


Width 60 cm per person Bedroom height 95 cm 2 doors 1 large porch 3 pockets


Fabric lets daylight through

Technical information


Total weight 2.3 kg
Separable parts to help transportation.
Flysheet 900 g
Bedroom 700 g
Pole kit 450 g
Pegs (11 pieces) 110 g
Guy ropes (6 pieces) 30 g
Bags 60 g + 60 g
Repair kit (ferrule) 20 g

To protect your product and increase your protection from the sun and bad weather, you can complement your MT900 UL 3P tent with a survival blanket type groundsheet.
The weight, volumes & sizes may vary slightly owing to production tolerances.

Inner space

Length of the bedroom 215 cm
Width of the bedroom 180 cm at the head and 140 cm at the feet
Height of the bedroom 95 cm
The large front porch (storage space between the bedroom and the flysheet) is 100 cm deep and 190 cm wide, more or less 2 m² offering a large storage and living space. Sheltered from bad weather, this can be used to store 3 backpacks with 50 to 70 L volume approximately, and to store and organise your bivouacking equipment.
3 pockets in bedroom.

Architecture, tent poles and tent pegs

Lightweight, shock and frost resistant aluminium pole: 7001 T6 Yunan SD70PF Ø 9 mm and Ø 9.5 mm aluminium.
Optimised square tent pegs: “anvil” head, oversized main part, extremely resistant and lightweight (7075 T6 aluminium). Non-anodised for a lower environmental impact.

The two tent poles form a tunnel that is not free-standing. This structure forms a very light tent that needs to be fixed to the ground and does not stay up alone.


Extremely quick pitching/striking. The flysheet and bedroom are pre-assembled. Insert the tent poles into the flysheet cover. It is also quick to strike.
To store the tent in its bag, fold the tent in half to about the length of the bag, fold up the poles into a bundle onto the bedroom or flysheet, roll everything up tightly to slide into the bag.


Forclaz tents are laboratory-tested: pitched tent, 200 litres/m²/hour (3 hours, equivalent to a tropical storm). They are also tested in the field by a sample user group.
20 denier polyester (PES) flysheet and 40D polyamide (PA) groundsheet have a polyurethane coating (inside) and silicone (exterior).
Seams taped with heat-sealed strips.
Multi-component bedroom combining breathability, wind protection and prevents condensation

Wind resistance

We test all our tents in a wind tunnel on a turntable where we can expose each side of the tent to the wind.
To test its wind resistance, the tent must be properly pitched, taut but not stretched, with all the guy ropes in position around the tent. It should remain habitable at wind speeds of 70km/h, measured near ground level.
Our tents are certified by the CSTB independent laboratory in Nantes.

Ventilation and condensation prevention

Bedroom with mosquito screen for ventilation and water-repellent fabric to protect from condensation and draughts. Large vent at front of tent and additional vent at feet end.
To reduce condensation inside your tent, it must be properly pitched, with the fabric kept taut without being over-stretched. Vents and good air flow will help reduce humidity inside your tent.


3-season tent: your tent will protect you from the harsh weather conditions you can encounter in the spring, summer or autumn. It will withstand light snowfall but is not designed to withstand heavy loads that would weigh on the structure.
In case of snow, remember to shake your tent regularly in order to bring down any snow that has accumulated to avoid putting too much weight on the structure of your tent.

Environmental approach

The tent poles are coloured using an innovative anodising process that does not use nitric and phosphoric acids.
The pegs are not coloured or anodised (no acid is used). They may have a rough or used appearance but still have all their technical features.These actions help to reduce the environmental impact of your product.

Repairs and After-sales service

As designers and users who love our playing field, we care about the durability of our products, that’s why all our tents are designed to be repairable. You will find the detachable parts (poles, bedroom, etc.) in store or in the workshop of your local Decathlon, or on the website.
If you have a problem, don't hesitate to have your tent looked at in your local Decathlon store.

Repair kit (ferrule, patch): 20 g


Your tent is designed for itinerant bivouacking, it is therefore not designed for static use in the sun.
We recommend that you avoid leaving it in the sun as the ultra-light fabrics can be sensitive to UV light, that damages them.


2 years.
All our tents are repairable. Parts and information in store or on our website


2.3 kg
Total weight

Product concept & technology

Product Composition

Inner fabric 80% Polyamide, 20% Thermoplastic Polyurethane Main fabric 80% Polyester, 20% Thermoplastic Polyurethane Pole 100% Aluminium


Storage: after use or cleaning, wait until the tent is perfectly dry before putting it away in order to avoid bad smells and mould.

User Directions

For more comfort, use a mummy-shaped mattress.

Approved By

This tent has been tested and validated in the field in real-life conditions. It was used for 5 weeks by several people who went trekking in the Canary Islands for 2 weeks, followed by 3 weeks on the GR10 route in the Pyrenees.
It was also tested by Tom and Alex for almost 18 months in Asia and Oceania.

Maintenance advice

Do not wash

Do not bleach

Do not tumble dry

Do not iron

Do not dry-clean


Tunnel Trekking Tent - 3 person - MT900 Ultralight
Tunnel Trekking Tent - 3 person - MT900 Ultralight
Tunnel Trekking Tent - 3 person - MT900 Ultralight
Tunnel Trekking Tent - 3 person - MT900 Ultralight
Tunnel Trekking Tent - 3 person - MT900 Ultralight
Tunnel Trekking Tent - 3 person - MT900 Ultralight


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