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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

Band Size

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

Reviews (864)

4.5

71% Recommended this product

Mentions
18 April 2026Wagon64

Maximum thermal cream jumper

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Really nice thermal tops would definitely recommend, very soft and long great to keep the cold weather out

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

17 April 2026Butterflylala

Great quality and worked splendidly.

Originally posted on marksandspencer.com (UK)

This is an amazing addition to my wardrobe! It’s lovely and soft with a comfortable stretch fabric, I struggle to keep warm, it kept me very toasty and I wore it as a top under a suit I wore to an event on its own and it looked great 😊. 10/10

Helpful?

02 April 2026Carrie_

Very warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very effective, warm and comfortable. Perfect for when I was in a very cold Berlin for a few days

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

27 March 2026Angemul

Warm and cosy thermal.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I already have the top in brown and also black. Its great for cold weather. I particularly like the high neck. My neck gets cold. I'm elderly so i need to keep my feet, ankles, neck warm. It feels cosy and soft. I like the long length of it over my hips too.

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

26 March 20268yellowhoneybees

Soft, warm and good colours.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I wear these fleeces as just a top not as underwear. Love the green & dark red. Soft and warm. More of these please next 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

26 March 2026Christine 159

Lovely and warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely and very warm but comes up a bit small I had to order the next size up

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

25 March 2026Peakster

Mother’s Day Gift.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I bought it for my Godmother for Mother’s Day and she absolutely loves 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

24 March 2026HannahOnx

Great quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great material, the thermals were great for skiing, washed well also and lovely 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

23 March 2026Karank

Great quality + lovely colour too- great value too

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I love these Heatgen tops bought quite a few in different colours- always keeps us warm 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

23 March 2026Iloveglass44

Too tight

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Although this thermal top was lovely and soft and I was tempted to keep it, it was too tight on me even though it was my correct size, so I returned it.

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

21 March 2026MPtel

It's OK!

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

It seems M&S have changed the material of these tops I preferred the previous heatgen top I purchased which had a fleece inner only it seems to keep me warmer than the new one I brought!

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 March 2026GeeneeC

Great thermal top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Really comfortable top cosy and very stylish. 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

18 March 2026Ew115

Nice warm top and lovely colour

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought whilst in the sale for next winter. Tried it on and happy with it. Probably should have gone up a size as I prefer things loose on me.

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 March 2026Migs43

Cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Love these thermal vests, so warm and cosy and in a good range of colours.

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 March 2026Man 79

Great quality, i would recommend it to a friend.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very pleased with this fleece top brilliant good fit and lovely and soft 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

14 March 2026Ipswich1

Really comfortable & cosy; washes well.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Really warm & easy to wear. Can be worn underneath clothes or stand alone. If you wear on its own, I suggest you order a larger size as it is very fitting. I am a 12-14 & I have a 2 x size 18 but think I perhaps should have gone for a size 20. Washes well too.

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

14 March 2026amberco

Great quality!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Absolutely the warmest cosy top ever 👍🏼 and brilliant price in the sale! Would love a tab at back of the collar to hang it up!

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

13 March 2026anemoneuk

Extra layer of warmth

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Have a few of these max heatgen tops and wear them as an underlayer or on their own as a top and even worn in bed on a really cold night

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

13 March 2026Nicoletta16

Love the warmth

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

So wonderfully snug and keeps my neck and décolleté warm enough without me feeling strangled. Love this and entire thermal range!

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

13 March 2026winterlovinggirl48

So warm and cozy.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought this in the sale, great top, very warm and feels super soft, slim fitting and nice and long.

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

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