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Heatgen™ Maximum Thermal Fleece Top

Product code: T329224

About this style

Embrace warmth with this Heatgen™ Maximum Thermal Fleece top. The luxuriously soft fleece fabric features our innovative Heatgen™ technology for superior insulation during the coldest weather. Long sleeves and added stretch ensure a comfortable, flexible fit that moves with your body while maintaining heat retention. The sleek design makes it perfect for layering or wearing alone for maximum thermal protection. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

M&S

Heatgen™ Maximum Thermal Fleece Top

€29

Colour

Size

Also available in: Tops
Free standard delivery over €75, otherwise €4.50

Reviews (1246)

4.8

79% Recommended this product

Mentions
03 November 2026

Great quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Brilliant staple this winter. So soft and comfy, bringing that warm feeling wherever I go. It’s snug but I wanted it so it can fit under jumpers and blouses.

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 November 2026nanny2kids

Lovely soft warm top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely soft warm top to wear either on its own or under a jersey/blouse does come up small (I’m size 16 in M&S) so bought size 20 like other reviewers & it fits snugly

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

01 November 2026Nick and Pearl

Excellent, extremely warm.

Originally posted on marksandspencer.com (UK)

My 94 year old mother thinks these thermal tops are amazing, she is so happy as they keep her very warm and cozy.

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 2026powerM

Definitely small

Originally posted on marksandspencer.com (UK)

So I ignored all the reviews about how tiny this is... Don't do that! I'm usually a 10/12 and thought the 12 would do because I wanted it quite tight to keep me warm as that's the point of thermal-wear... I mean, it fits but it is TIGHT. Definitely needed a 14 for looser, more comfortable fit.

Helpful?

29 October 2026Miss Nice Lady

Size up

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Size up very tight fitting but fabulous shade of brown

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

29 October 2026Suzyshopaholic

Love these tops

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Love, love, love these tops and I have them in every colour available. They're super soft and cosy and really warm for a cold morsel like me. Perfect for under fleeces and tops. If I was being pernickety, the only thing I wish, is that they weren't quite so long, because even if I tuck them into my knickers, they bunch up at the top of the legs and show if you're wearing tight fitting trousers or jeans. Having said that, I still think they're the best on the market. Would love to see some vibrant colours in them, like bright pinks and reds, because they look good enough to show under jackets or flannel shirts.

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 2026Julieannxx

Way too tight and extremely long

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Ridiculously tight and way too long. No stretch whatsoever and you would need to be six foot tall for this to fit. Had to return and shop elsewhere.

Helpful?

27 October 2026Hulagirl

Warm and comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Good quality, comfortable and warm washes well and dries quickly. I wear for my 6am dog walk and they are great

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 2026No socks showing

Cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Really cosy and warm however for me I found the next too high

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 October 2026Brinleysmum64

Soft, warm and a great fit!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I love these thermal tops and have them in various colours. Great worn on their own or underneath a blouse or jumper.

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 October 2026InternationalBeauty

Cosy brown top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great thermal top which I am wearing under jackets and gilets. Very small fitting so I sized up 2 sizes to suit.

Helpful?

22 October 2026SarahT81

A beautifully thick but fitted thermal…

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I’m someone who really feels the cold so am so pleased to add this to my thermal collection. It’s thick but fitted…I did size up 2 sizes as per other reviews & it fits perfectly. Would recommend.

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

21 October 2026Miss una

Great thermal vests

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Good fit good quality l have six vests in different colours and styles . They keep you warm without having to be bulky

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 October 2026Lazyhostess

Cosy and comfy.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

A really comfortable cosy top for layering, although could be worn as a top on it’s own too, not too clingy and true to size. Wish it had a roll neck then I’d orobably live in it till next Spring. Great colour, slots in nicely with Marks’ other bitter chocolate brown purchases.

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 October 2026Patsy67

Lovely warm thermal top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I bought two of these tops to go with my thermal leggings. They are a nice length, wash well and do not need ironing. I ordered the next size up as they are a bit clingy and they fitted perfectly.

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

16 October 2026jinc

Great quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I love the Heatgen range of clothes for the winter time, they are great for layering

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 October 2026Thankyou1

Lovely colour

Originally posted on marksandspencer.com (UK)

Just right for wearing under a waistcoat in this ovlety autumn weather.

Helpful?

13 October 2026Hillywack

Cosy and warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Love these, have bought a number over the last few years. I work in an old Georgian building with no insulation in the walls so when the temperature drops you can feel the cold from the brickwork. These have helped a great deal in keeping warm, have also bought the thermal leggings

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 October 2026Nicbuch54

Great thermal top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Thermal top purchased as undergarments for. December trip to Finland. The top feels very warm, cosy and comfortable and fit true to size. .It's also quite long so will keep my midriff warm too. Very pleased with my purchase.

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 October 2026MummyB100

Comfy & Cosy!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I bought 2 new maximum thermal tops this autumn, in aubergine and chocolate, they are a staple item in my winter wardrobe, very soft and warm, I think a slightly longer length this year which I like.

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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