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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, otherwise €4.50

Reviews (883)

4.5

71% Recommended this product

Mentions
02 November 2026Vics123

Love it!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought as a pyjama top. Lovely soft, warm material, washes well, keeps the draughts out. Flattering, you could wear it as a normal top. The neck is good too as it keeps you warm but isn't too high to feel stifling.

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 November 2026tottyfruity

Very cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

The max thermals are exceptional. I but M&S thermals every year, these are the best yet. Comfortable, soft and incredibly cosy.

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 October 2026Kegs0

Great top for winter walks

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Nice fit, looks good on and keeps you warm, great top for winter walking.

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 October 2026CSM62

Great. Warm. But snug.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I have a number of Heatgen tops in different colours which, for the last few years I wear on repeat under jumpers/shirts during the winter. They are great. I bought these because I like the funnel neck style. These are just as good in all ways except they are very small. I bought a size 12 having read the feedback but still extremely snug. I’m considering an exchange for a larger size. Other than recommending you purchase at least one size up-I’d go two if you’re busty, fab, warm, soft top.

Helpful?

30 October 2026AliBi19

Very warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Thick, warm fleecy top. Currently working in the Scottish Highlands and wearing this over a thinner thermal top and under a jumper. Keeps me toasty and the slightly higher neckline helps keep my neck warm. Really like the M&S thermal clothing range and the 3 different thicknesses work for me. Recommended.

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

29 October 2026Crosslee

Great quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Does exactly as it says while being stylish. Can be worn under clothes or on its own. Washes really 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

28 October 2026HM42

Very warm and comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These tops are excellent for keeping you warm. Long in the body and very comfortable to wear. The fabric is thick so can be worn on its own or under a jumper or cardigan on really cold days. Wash well as keep their shape and do not lose their thickness .

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 October 2026CosyParker

Excellent warmth

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Excellent warmth, but definitely go up one size if you want to wear it as a top or your bra will show unflatteringly.

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

25 October 2026Snowgoose

Thermals

Originally posted on marksandspencer.com (UK)

Love the vest and the colour. Previous person said how the neck is only sewn at each side.. and this is true. Possibly for the smooth look.. but different to last years. Still love them. Couldn't do winter without these now!!

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

23 October 2026Beth 68

Great quality

Originally posted on marksandspencer.com (UK)

I love these thermal tops. They keep me so warm. They are excellent.

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 October 2026violetmaryann

Great material

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely warm thermal top, ideal for layering in the winter months, nice quality they are quite snugg fitting so go up a size

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

01 October 2026Expat Mum

Warm and cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Keep w as em. Perfect for layering under a cardigan.

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 September 2026Clayfield

Winter Basics

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I have been buying these fleeces for the last 5 years and just about live in them the moment it becomes chilly. I like the changed neck which is softer than the ones I had before that were more structured. I have recommended them to others. Fit is great.

Helpful?

27 September 2026Karen J

Cosy Winter top - for base or layering

Let very cosy top for Winter. Looks like a jumper, so can be worn on its own if desired. Quite thick, but would be a very warm base layer

Helpful?

16 September 2026kerrigal

Small size

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I already own a couple of these in black and navy. However this cream one in a size 14 - and normally I take size 12 - was far too tight so I returned it and ordered size 16. This is still quite snug but I can’t bring myself to order size 18.

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

08 September 2026Janebun93

Baffled!

Originally posted on marksandspencer.com (UK)

An extremely small size 16. M&S never ceases to amaze with their sizing system!

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

28 June 2026AshMcK65

Winter Game Changer!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

A completely game changer for winter and they are great quality and have washed beautifully! Have already ordered more!

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 June 2026Ian81

Warm and cosy top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Did the job perfectly kept nice and warm,now put away as the weather has finally picked up

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 May 20261ladyinlincolnshire

Stylish & warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very pleased great quality & good fit -but quits fitted I sized up

Helpful?

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

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