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2pk Heatgen™ Thermal Long Sleeve Tops

Product code: T329101

About this style

Beat the chill with these Heatgen™ thermal shirt tops. Made with our innovative heat-retaining fabric that feels gloriously soft against your skin, they feature a scoop neckline and long sleeves. The added stretch ensures a snug, flexible fit that's perfect for layering as a baselayer, while the light warmth rating provides just the right level of cosiness. Comes in a convenient pack of two. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

Details & care

Care instructions

Machine washable

Features

Heatgen™ technology

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

Composition

66% acrylic, 28% viscose and 6% elastane (exclusive of trimmings)

Care

Wash at 40°C

Do not bleach

Do not tumble dry

Do not iron

Do not dry clean

M&S

2pk Heatgen™ Thermal Long Sleeve Tops

€33

Colour

Size

Matching items: Thermal Leggings
Free standard delivery over €75

Reviews (2432)

4.5

68% Recommended this product

Mentions
01 June 2026Sameer

Thermal Tops

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I’ve bought these thermal tops for a few years. They are a good design. Please keep the brushed cotton options and designs too.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

30 May 2026Jungian

Excellent thermal tops

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

The tops are thin, and fabulous for layering, with a good long body length. I have not had the opportunity to wear them, as we are undergoing a mini heat wave at the moment. I am sure I will make good use of them in the colder months.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

25 May 2026Thomasina

IDEAL THERMAL

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Use these all year round, in winter as a sub layer, in spring as a t shirt. So versatile and last ages. Replaced previous ones.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

18 May 2026dianedinky

Work well and excellent value

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

It's always best to get non-cotton undergarments for the wicking qualities (you don't want dampness in a cold climate or you'll freeze!). However, I found merino wool items very itchy so need the synthetic thermals. These ones are just perfect. Very cosy and comfortable and kept me warm in the Arctic. Scoop neck is low so never seen when layering and allowed me to wear a buff to keep chills out. I got my normal size 18 and fit was just right as 16 was a touch too tight but 18 was a close fit without being uncomfortable.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

16 May 2026JGx

Great lightweight warm tops

Originally posted on marksandspencer.com (UK)

These are great! Lightweight warm tops. In the cream colour they are slightly see-through.. they are very lightweight but they are warm considering how thin they are. I find them a bit tight and always size up..

Helpful?

11 May 2026GNB

Great quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great quality, fits so comfortably. Suitable for underneath blouse, layering etc. would not be without these. Highly recommend it.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

10 May 2026Museum4fun

Light liners with long long sleeves

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

This top is ok i would prefer to have a set of cream and black or cream and white not both in aame colour. A little too long and sleeves are far too long however they are a good weight.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

28 April 2026madmaj

SO NOT THERMAL

Originally posted on marksandspencer.com (UK)

SO THIN no heat SHOULDN'T BE LISTED WITH THERMAL WEAR

Helpful?

24 April 2026GeorginaMarie

The best - a flexible wardrobe staple

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These tops are the BEST. Very lightweight, but also a really effective layer of warmth. They are great on their own, but brilliant under anything else close-fitting or lightweight that you want some extra warmth under without being seen, as they are close fitting. They make great winter PJ tops too :-)

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

20 April 2026Suzannejp

Great buy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great purchase and good value for money. Vests are a great thermal lining. Are comfortable and have a soft feel and are true to size. I wear on the motorbike and they are great for layering and keeping you warm and at the right temperature . A really good buy.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

18 April 2026shasea7

Warm but too snug

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I needed a bigger size but will keep for colder times as is a but too warm for spring

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

17 April 2026WazNo6

Don’t be fooled by how thin this is

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These t shirts are perfect for layering. Not bulky, yet lovely and warm

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

16 April 2026Silverbandh

Game Changer

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

have bought 4 of these now, are great, the scoop neck means they can't be seen under clothes and they really do add a good but thin layer of warmth

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

15 April 2026Hml25

Great value, comfy and warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I bought these as the old black sparkly ones I had are finally wearing out. These are really comfortable, surprisingly warm considering they are quite thin material (also good as they are not bulky) and great value. However they come up quite small - I go up at least one size

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

12 April 2026Anonymous together

Fir Comfort and quality choose M&S

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Have had these for several years now and always find they fit well are comfortable and act as a good base layer. The quality is very good

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

11 April 2026Janiejinx

Nice Top

Originally posted on marksandspencer.com (UK)

Love the heatgen line of clothes but I sent these back as they weren’t as thick as I was expecting. The neckline was important to me but they didn’t appear to have the tops I had last year

Helpful?

04 April 2026Gouldy64

Great top for extra layer

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great tops last for ages neck line is great and nice and thin to go under clothing

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

04 April 2026Nonna26

Great quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I am always pleased with my purchases from Marks. The staff are forever helpful and friendly.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

31 March 2026bonniegirl

Only 4 stars as the sleeves are really long

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Bought the thermal tops to wear under tops in the cold weather. I’m 5’3” and the sleeves come to my fingertips! Other than that tops are good.

Reviewer Ratings

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True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

29 March 2026Shalders

Two thumbs up.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great. My young person recommends for a base layer. Pick up Delivery was quick and easy. Thanks guys

Reviewer Ratings

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True to size

Helpful?

Reviewer Ratings

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True to size

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