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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

£22

Colour

Customers say:

Fits true to size()
Band Size

Matching items: Thermal Leggings
Also available in: Tops
Free standard delivery over £75, otherwise from £3.99

Reviews (890)

4.5

71% Recommended this product

Mentions
06 November 2026Su Bu
Verified Purchase

Soft, cosy and keeps me warm

Yes, I recommend this

Lovely and soft, super snug and cosy, and it keeps me warm!

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

05 November 2026Abi p
Verified Purchase

Good quality thermals

Yes, I recommend this

Great staple for winter nice and soft keeps you warm. Looking to get some for my kids

Helpful?

04 November 2026Scotland2
Verified Purchase

Cosy Top

Yes, I recommend this

Have not warn this top yet but it feels really cosy and will be lovely for the colder days. The neck is very interesting too.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

02 November 2026Vics123
Verified Purchase

Love it!

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 did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

01 November 2026tottyfruity
Verified Purchase

Very cosy

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 did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

31 October 2026Kegs0
Verified Purchase

Great top for winter walks

Yes, I recommend this

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

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

31 October 2026CSM62
Verified Purchase

Great. Warm. But snug.

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
Verified Purchase

Very warm

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 did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

29 October 2026Crosslee
Verified Purchase

Great quality

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 did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

28 October 2026HM42
Verified Purchase

Very warm and comfortable

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 did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

27 October 2026CosyParker
Verified Purchase

Excellent warmth

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 did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

25 October 2026Snowgoose
Verified Purchase

Thermals

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 did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

23 October 2026Beth 68
Verified Purchase

Great quality

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

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

05 October 2026violetmaryann
Verified Purchase

Great material

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 did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

01 October 2026Expat Mum
Verified Purchase

Warm and cosy

Yes, I recommend this

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

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

28 September 2026Clayfield
Verified Purchase

Winter Basics

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
Verified Purchase

Cosy Winter top - for base or layering

Originally posted on marksandspencer.ie

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
Verified Purchase

Small size

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 did it fit?

Small

Helpful?

Reviewer Ratings

How did it fit?

Small

08 September 2026Janebun93
Verified Purchase

Baffled!

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

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

28 June 2026AshMcK65
Verified Purchase

Winter Game Changer!

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 did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

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