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Established 2006. Kent's Only Authorised 5.11 Tactical Retailer

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Warmth without the bulk

The Magnum Mars Base Layer Trousers are seamless thermoactive long johns built to sit next to the skin and do the hard work of temperature control. Wicking fabric draws sweat away from your body through an open capillary structure, so you stay dry and warm rather than damp and cold during a long day in the field.

Engineered to move with you

Using a bodymap design, the fabric places active zones of maximum breathability and stretch exactly where your body needs them. The result is a base layer that flexes with every crouch, sprint and vault without bunching or restricting movement.

Comfort you can wear all day

The seamless construction removes the stitched seams that cause chafing and pressure points, while the fabric’s low moisture absorption and biological resistance help regulate temperature and keep odour at bay across back-to-back games.

Layer up for the cold

Ideal under combat trousers for winter airsoft or any cold outdoor pursuit, and available in sizes Large to 2XL. Pair it with the matching Jupiter top, and browse more clothing to complete your cold-weather kit.

General
BrandMagnum Boots
ColourBlack
Build & furniture
ConstructionSeamless knit with bodymap active zones
Other
SizeL, XL, 2XL
TypeSeamless base layer trousers / long johns
FunctionMoisture-wicking capillary system
InsulationThermoactive, cold-weather rated
SizesLarge to 2XL

Frequently asked questions

What is a base layer for?

Worn next to the skin under your trousers, a base layer wicks sweat away and traps warmth. It keeps you dry and comfortable during cold games and long outdoor sessions.

Are these warm enough for winter airsoft?

Yes. The Mars trousers use thermoactive fabric with strong heat insulation, making them a solid choice for cold-weather skirmishes and outdoor work.

Why seamless?

Seamless construction removes the stitched ridges that cause rubbing and hot spots, so the trousers stay comfortable under kit for hours at a time.

What sizes are available?

They come in sizes Large to 2XL.

Is there a matching top?

Yes. Magnum makes a matching Jupiter base layer top to complete the set for full-body warmth.