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Heatgen™ Maximum Thermal Fleece Top

Product code: T329225

About this style

Stay cosy during the coldest weather in our Heatgen™ Maximum Thermal fleece top. The high mock neck and long sleeves provide extra warmth, while the soft fleece with added stretch ensures a comfortable fit. Our warmest thermal technology yet keeps you snug without bulk, letting you embrace winter with confidence. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

M&S

Heatgen™ Maximum Thermal Fleece Top

€29

Colour

Sale items

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Matching items: Thermal Leggings
Also available in: Tops
Free standard delivery over €75

Reviews (839)

4.5

70% Recommended this product

Mentions
11 March 2026nor52

Great thermal top.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Good quality Thermal top. Lovely wine colour and very 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

11 March 2026SomersetBigShopper

Very Cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I work outside and in winter thermal tops are a must. Have worn M&S thermal tops for years as they wash well and keep their shape. This top is cosy both inside and out. Great purchase again.

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 March 20266Mumstheword3

tight squeeze.

Originally posted on marksandspencer.com (UK)

Well made and very warm. However I sized up as advised but it was still much too tight

Helpful?

10 March 2026Tina 2808

A really stylish top that keeps you extra warm.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

A really lovely thermal that doesn’t look like a thermal. It is really effective and keeps you warm but looks very stylish at the same time. Good quality and feels lovely to wear.

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 March 2026Rambett

Comfortable fit

Originally posted on marksandspencer.com (UK)

Love wearing these tops in autumn and winter as they are so warm and cozy to wear. Have purchased quite a few over the years for myself and family. Size small/10 fits perfectly.higHly recommend.

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 March 2026broomey

Fabulous

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Fabulous thermal top great fit and very warm perfect to wear on its own

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

09 March 2026Shahe

Bought About 7 of These

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

They’re soft, warm, re-wash well. The high neck is flattering - bought about 7 in case they sell out or change the design.

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

07 March 2026sukisue2

Warm comfortable Tops

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I started collecting these tops several years ago and have a good selection of colours and my go to every winter. Warm and cosy can be worn alone or under a jumper or cardigan for extra 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

06 March 2026David Gimes

Comfy and Cozy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very warm top, kept me wonderfully cozy whilst in Norway and layered very effectively.

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

06 March 2026Edfran 10

Snug and warm

Originally posted on marksandspencer.com (UK)

Am happy with my thermal top for warmth. However, the size is a little on the small side. I’ve had these before and this one is very tight fitting.

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

05 March 2026Jane Edinburgh

Another Heatgen Winner !

Originally posted on marksandspencer.com (UK)

Bought for warmth for winter dog walks along with a few other Heatgen Thermals. Lovely burgundy colour which doesn’t fade when washed and so cosy with a nice feel to the material. Bought Heatgen Thermals previously and never been disappointed. This years purchases are best yet. Well done M&S !

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

05 March 2026jaguar1954

Great thermal top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Super thermal top and lovely and warm. I wear these all winter, so mostly I can just where one of my quilted gilets instead of a coat. Highly recommend

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 March 2026talula1986

Great quality, wash well

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely tops, very warm, I have these in 4 colours Wash well, can wear as an ordinary top not just as a thermal.

Reviewer Ratings

How do you feel about the size?

A bit large

Helpful?

Reviewer Ratings

How do you feel about the size?

A bit large

03 March 2026Bolida

Neckline not right for me

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

I’m not sure on the neckline. It doesn’t sit well on me. Super quality 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

03 March 2026jw21

Soft material

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely soft material and the colour was great. Bought a size bigger than usual. Wish I had bought it at the beginning of winter. It was so warm.

Reviewer Ratings

How do you feel about the size?

A bit small

Helpful?

Reviewer Ratings

How do you feel about the size?

A bit small

02 March 2026ANGUSBRODIE1

Great Quality.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Love these thermal tops during winter, I have several of them and wear them all the time during cold months. They feel great and look good under shirts, tops etc. Worth every penny I paid for them.

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

02 March 2026Nan K

Soft and warm

Originally posted on marksandspencer.com (UK)

It’s very comfortable. Has a very soft feel to the fabric. The thermal quality is excellent too. It seems slightly smaller than a 14 but it feels cosy to wear.

Reviewer Ratings

How do you feel about the size?

A bit small

Helpful?

Reviewer Ratings

How do you feel about the size?

A bit small

02 March 2026LezahEv

‘Turtle’ thermal

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

This was very warm but the ‘turtle’ style collar wasnt to my liking si I returned the item.

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

01 March 2026Xandu

Very comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Although I would usually stay away from artificial fabrics, this fleece is so comfortable I ordered more. Lovely and warm. Very soft and easy to wash.

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 February 2026Nom2Plum

Thermal top

Originally posted on marksandspencer.com (UK)

This top is quite long in the body and close fitting. Sleeves are a good length to the wrist. It is well made though the neck fabric is turned over rather than attached. Fleecy lined

Reviewer Ratings

How do you feel about the size?

A bit small

Helpful?

Reviewer Ratings

How do you feel about the size?

A bit small

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