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Heatgen™ Medium Thermal Crew Neck Top

Product code: T329268

About this style

Made using Heatgen™ Medium technology, this thermal top offers medium warmth for cooler days without feeling heavy. A crew neck and long sleeves complete the simple, non wired shape. M&S designed this top to layer easily under regular clothing. M&S Collection: versatile styles in modern shapes with unique and playful details.

M&S

Heatgen™ Medium Thermal Crew Neck Top

€22

Colour

Out of stock online

Size

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Free standard delivery over €75, otherwise €4.50

Reviews (81)

4.5

78% Recommended this product

Mentions
13 November 2026Msdhumphreys

Love this ! Warm easy to wear

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very warm, soft, love it! Easy to layer, would defiantly 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

12 November 2026Puppy girl

Great product but new sizing frustrating!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely colour and thermal quality. However, rather frustrating sizing! Have bought size 10 for years which fits perfectly. Having read sizing advice and reviews which indicated new m and s sizing comes up small, I ordered a size small. Couldn’t believe how tight it was!! Have ordered a medium and await delivery to try it on- fingers crossed! It is frustrating not to be able to have recognisable and consistent sizing when you can’t try on in store. May we have the old sizing numbers back again! Do hope you will act on this!

Helpful?

11 November 2026Scottish Independence

Cosy layer for winter

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Cosy base layer, ideal for keeping warm in winter ❄️

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 November 2026Moomel

A Must in your Wardrobe

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Well....these are just fantastic! So good I bought another one. Not too thick and keep me lovely and warm. They also make a good basic under a shirt.

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 November 2026Elderly Lady

Cosy

Yes, I recommend this

Perfect for winter to wear under a shirt or a jumper or on its own. I bought three but returning the cream one as it was a very buttery colour. A white version would be much more usable.

Helpful?

10 November 2026AntheaC

Disappointingly short despite being cosy.

Originally posted on marksandspencer.com (UK)

Nice and soft & feels cosy. But far too short for me so rides up every time I wear it. Disappointing.

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 November 2026Shella 1

Heat gen t shirt long sleeve

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

This is the best thermal top I have ever bought I can't believe how warm it is can't wait to get another one

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 November 2026GayM

Great top and very cosy

Originally posted on marksandspencer.com (UK)

Lovely warm top that is not too thick. I have 2 of these now.

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 November 2026Stephanie Jackson

Warm top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I love this top it’s very soft material so comfy to wear and is warm enough for me. I’m usually a size 12/14 but bought the large size and it was snug so the medium would have been too small. Value for money.

Helpful?

10 November 2026BobbieDee

Snug and warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very comfortable and a good fit. Nice colour and it washed well.

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 November 2026JB94

Warm and comfortable top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely warm top. Top comes up small, I went up to a large, normally am medium. Despite this, the top is warm and comfy and can be worn layered under a jumper. Washes well on gentle wash

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

09 November 2026Jacster1

Not as good as before

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

I’ve bought these tops every year but the sizing has changed as has the quality. The medium was too small on the shoulders and the large too big all over. The material also had a sheen which I didn’t like so I returned both sizes.

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

09 November 2026Sueb8831

Lovely and warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Already have these in other colours. Lovely and warm in this cold weather.

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

08 November 2026Hillwalker13

Order a size up

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Quite a small fit! Im usually a size 8 so ordered a 10 and it was still quite figure hugging. That said, can fault it’s cosiness

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

07 November 2026Jan612

Great Thermal Top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely to wear nice soft material and helps to keep you nice and warm. Neckline just right and sleeve the right length. Will most certainly buy another one in the future

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

07 November 2026LyndaC14

Very cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very comfortable layer next to skin, can be worn on its own nicely or as an extra layer, purchased the black and aubergine, altho brown one last year that I purchased had different composition, feel this new fabric will ball easily, but still a very practical thermal top.

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

06 November 2026juneyjune

Warm hugs

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

What a great base layer this is. It is clingy. stretchy and the length is perfect . It feels like a warm hug instantly . Not bulky and fine enough to wear under sweaters . Perfect, just perfect to keep you 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

05 November 2026annemartar

Love it

Originally posted on marksandspencer.com (UK)

It is lovely, warm, comfortable and soft. It fit perfectly. It is quite long which I like (I’m 5’7”). I have now ordered another couple in different colours and wish I’d come across it sooner. It also washes well. I would happily recommend this top.

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 November 2026Lesley 24

Cosy thermals

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

So warm without being too thick. Can be worn under clothes or on its own as not see through. True to size and would 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

05 November 2026Francophile47

Good Quality Great Value

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These Heatgen tops are light, but like the others I purchased at the same time, they are cosy, and a good length. They represent good value and were delivered promptly!

Helpful?

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