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M&S Collection

2pk Heatgen™ Light Thermal Long Johns

€ 40

COLOURDenim
SIZE

Free standard delivery over €50

Product code: T149483

About this style

When the temperature drops, our ultra-lightweight thermal long johns add a cosy extra layer. Regular fit, with supersoft seams, heatsealed care labels and moisture-wicking fabric for maximum comfort. Our clever Heatgen™ technology uses an innovative fibre blend, helping your body to generate and retain heat so you can stay warm when the weather gets chilly. Fly front fastening.

Light warmth for cooler conditions and everyday comfort.

Details & care

Style

Regular fit

Fly front fastening

Added stretch

Features

Heatgen™ technology

lightweight and supersoft, designed to keep you warm when the weather gets chilly

Composition

38% acrylic, 29% cotton, 29% viscose and 4% elastane lycra® (exclusive of trimmings), Ribbing - 39% acrylic, 30% cotton, 29% viscose and 2% elastane

Care

Wash at 40°C

Do not bleach

Tumble dry low temperature

Iron at medium temperature

Do not dry clean

Delivery, collection & returns

Delivery

Standard

FREE over €50, or €4.50

Collection

Collect from store

FREE

Returns

Ireland returns

FREE

Exclusions apply

Reviews (543)

4.6

67% Recommended this product

Mentions
2025 februar 05christinegee

Great quality really soft to touch

Originally posted on marksandspencer.com (UK)

Use as pj bottoms as they are really comfortable and easy to wash and dry

Helpful?

2025 februar 05Dragon head

Warm and cozy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Good quality very comfortable to wear lovely and warm

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How do you feel about the size?

True to size

2025 februar 05Sue0953

Great winter warmth

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

A good fit - true to size. Very warm and soft material

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Good

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Good

How do you feel about the size?

True to size

2025 januar 31SEAGULL

Excellent!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought for husband. He was very please with them. Nice and warm and comfortable.

Reviewer Ratings

Quality

Excellent

Value for Money

Good

Style

Excellent

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Good

Style

Excellent

How do you feel about the size?

True to size

2025 januar 30Marilyn C

So warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

So cosy, comfortable to wear under trousers or joggers, reasonably priced and wash well

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How do you feel about the size?

True to size

2025 januar 30Klkna

Light but warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Fine and lightweight but very effective as part of a layered system of warmth.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Average

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Average

How do you feel about the size?

True to size

2025 januar 29TLS1996

Excellent buy, would recommend

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Perfect, true to size. Comfy and excellent quality. They really do help you stay warm.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Excellent

How do you feel about the size?

True to size

2025 januar 27flopsico

Happy Hubby

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I am told they are comfortable, warm and worth the money

Reviewer Ratings

Quality

Good

Value for Money

Good

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Good

Value for Money

Good

How do you feel about the size?

True to size

2025 januar 27kaylou6

Fabulous!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lightweight and barely noticeable, these thermals do exactly what they are meant to - keeping legs warm and toasty without restrictions. Worn under both jeans and joggers!

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Poor

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Poor

How do you feel about the size?

True to size

2025 januar 27Lola lexi 20

Great quality

Originally posted on marksandspencer.com (UK)

Bought for recent trip were temperatures minus 6-12 keep really warm. Good fit

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Good

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Good

How do you feel about the size?

True to size

2025 januar 26Julia57

Comfortable wor outside during winter a lot more

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought as a present for my son who works outdoors and he loves them

Reviewer Ratings

Quality

Excellent

Value for Money

Good

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Good

How do you feel about the size?

True to size

2025 januar 23Olymp58

Good product

Originally posted on marksandspencer.com (UK)

The product is very good, helps keep you warm, very good for immobile people and wheelchair users

Helpful?

2025 januar 18

Disappointing

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

I am not very happy with these long johns. They feel cold to the touch, which is a strange effect in something designed to make you feel warmer. I have only worn them a couple of times and they do help keep your legs warm, but they feeI odd. I am a bit annoyed that they came as a two pack, as I will not be wearing them enough to justify buying two pairs.

Reviewer Ratings

Quality

Fair

Value for Money

Average

Style

Average

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Fair

Value for Money

Average

Style

Average

How do you feel about the size?

True to size

2025 januar 16Doris 22

Useful

Originally posted on marksandspencer.com (UK)

Enabled wareing of ordinary trousers in very cold weather.

Helpful?

2025 januar 16baggins361

Heathen long John pants

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These heatgen pants are true to size, cosy warm fabric and wash well. Great for warmth when working outdoors.

Reviewer Ratings

Value for Money

Excellent

Style

Excellent

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Value for Money

Excellent

Style

Excellent

How do you feel about the size?

True to size

2025 januar 12neil73

Great for winter!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely material. Great combination of being nice and light and keeping you warm.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

How do you feel about the size?

A bit large

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

How do you feel about the size?

A bit large

2025 januar 11Kat sat star

Poor quality not warm

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

These used to have some wool and cotton in them making them warm. This pair Has high %of acrylic in then which maybe good for carpet but not good form undergarments. The quality was awful to the touch so I returned them. MnS pls can you stop sacrificing quality .. stop reinventing the wheel.

Reviewer Ratings

Quality

Poor

Value for Money

Poor

Helpful?

Reviewer Ratings

Quality

Poor

Value for Money

Poor

2025 januar 10LollyLelly

Repeat purchase.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

My husband wears these under his running trousers or shorts in the cold weather. He is very impressed with them. They are quite lightweight but very warm and he’s now bought a 2nd pack of them so he must like them!

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Average

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Style

Average

How do you feel about the size?

True to size

2025 januar 08DaniKim26

Thermal Leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These were light and soft comfortable to wear but also very warm . My husband wears them under his work uniform and they have really help during the very cold days . They wash and dry easily

Reviewer Ratings

Quality

Excellent

Value for Money

Good

Style

Average

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Good

Style

Average

How do you feel about the size?

True to size

2025 januar 04gramps12

Thermal underwear.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Nice comfortable material which keeps your legs warmer during the cold spells. Leg length is a little long but not a major problem. Repeat purchase.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

How do you feel about the size?

True to size

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