Mountain Warehouse Merino Thermal Baselayer Pants for Men

Mountain Warehouse Merino Thermal Baselayer Pants for Men are merino wool long johns with a built-in fly and elastic waistband. The listing describes them as lightweight, breathable and moisture-wicking, for layering during cold-weather activity.

At a glance

Merino wool is described as helping regulate body temperature in warm and cold conditions.
A built-in fly and elastic waistband are specified.
The manufacturer says the fabric wicks moisture, breathes and is lightweight.
The stated care instruction is a 30 degree wool cycle.

Price

£25.64Save 27%

Reference price: ~~£34.99~~

Price checked: 13 Nov 2026

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Pros and cons

Pros

The fly and elasticated waistband provide practical details for an everyday base-layer bottom.
Lightweight, moisture-wicking construction is intended to layer without adding bulk.
The listing gives a specific wool-cycle washing instruction.

Technical specifications

8 specifications

Identity
Brand	Mountain Warehouse
Model number	053249
Department	Men's

Fabric and care
Material	Merino wool
Care	Machine washable on a 30 degree wool cycle

Design and features
Waistband	Elastic waistband
Fly	Built in fly
Fabric properties	Naturally antibacterial, breathable, high wicking, lightweight

What to know before buying

Listing details to confirm

The seller describes this as a close-fitting base layer. Customer feedback is mixed on material thickness, so expectations of warmth and bulk may differ. The listing's separate statement that the material is laboratory tested as waterproof conflicts with its description of breathable, moisture-wicking base-layer fabric. Treat that waterproof claim as unconfirmed and do not assume these trousers replace waterproof outerwear.

Who is it for?

A good fit for

Men seeking merino wool base-layer trousers for walking, hiking, cycling or cold-weather layering.
Buyers who want a lightweight layer with a built-in fly and elastic waistband.

Less suited to

Anyone seeking a confirmed waterproof garment or a clearly specified fabric weight.

Mountain Warehouse Merino Thermal Baselayer Pants for Men · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 823 ratings

5 stars74%74%
4 stars15%15%
3 stars5%5%
2 stars3%3%
1 star3%3%

Customer feedback describes the trousers as warm and comfortable, with positive comments on fit, softness, quality, functionality and value. Some customers also report that they avoid overheating during cooler-weather activity. Opinions differ on thickness, which matters if you need a particular level of insulation or a very low-bulk layer. These are reported perceptions, while the product listing separately claims lightweight, breathable merino construction.

Positive themes

Customers report warmth and comfort, with positive feedback also covering fit and softness.
Customers praise quality, functionality and value for money.
Some feedback says they suit hiking in cooler months without causing overheating.

Mixed feedback

Customers disagree about how thick the material feels.

Frequently asked questions

What material are these base-layer pants made from?

The listing identifies the material as merino wool. It does not state a wool percentage.

Do the pants have a fly?

Yes. The listing specifies a built-in fly.

How should they be washed?

The stated care instruction is machine washing on a 30 degree wool cycle.

Are these trousers waterproof?

The listing makes a waterproof claim, but it conflicts with the garment's described breathable, moisture-wicking base-layer use. Waterproof performance is not confirmed by the supplied details.