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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

Reviews (1195)

4.8

79% Recommended this product

Mentions
21 March 2026Karank

Love these Heatgen tops - ideal when it’s chilly!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely cosy tops ideal for colder weather- they are really 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

21 March 2026Nonnie11

Good quality

Originally posted on marksandspencer.com (UK)

Good quality, cosy and definitely worth purchasing for cost

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

21 March 2026Carolinepompom

Snug fit

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I have one of these from a couple of years ago & I also have the thinner ones aswell. I nearly sized down as a size12 is usually too big but luckily I didn’t as it is very snug compared with my others.

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

21 March 2026bondgirl21

So soft and comfortable fit

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great item and so soft and will be a staple wear in my winter wardrobe. Thicker material than what I thought but this is an added bonus. Will be looking to buy another in a different colour for the winter. Got this item half price in the sale which is an added bonus 😀

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

21 March 2026bee77

New thermal tees

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Time to buy new thermal tees lovely & warm plus great quality & 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

19 March 2026Holly1506

Great!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought this to take to Iceland, it was great. Kept me very warm & toasty!

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

19 March 2026Marie154

Lovely and fluffy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

It's very soft and a nicer colour than it looked in the photos. I haven't worn it yet so can't comment on how warm it is.

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 2026hill 1

Disappointed after washing

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

I bought three of the heatagen tops , yes they are warm , yes they are extremely comfortable to wear but unfortunately have become extremely bobbly! Not what I expected from M&S .. they are not something I would wear unless underneath something now as they are so bad . I bought them intending them as a top layer . Very dissatisfied.

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

17 March 2026Ophilia

Thermal top, hottest heat.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Now this is a proper thermal top. Max heat, perfect. I live in these all winter, and have about 8 pairs.

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

17 March 2026GwendolineS

Super warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Love these heatgen clothing, have some of each weight. these extra warm ones are super warm ,soft ,comfortable, Washes well , I order smaller size the stretch is good

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

16 March 2026Troublenstrife

Love it

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

This is the 3rd top I've bought and can't recommend it highly enough

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 2026LMH73

Cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great cosy top. Very form fitting so sits well under other tops.

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 2026Gran to 3

warm and snuggly

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

warmest thermals i have ever bought - saving a fortune on heating

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 2026Fab10

Warm thermal

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

This is a warm thermal but I find it too fitted. I ordered the next size up but I still find it a little tight.

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

15 March 2026RachelKH

Soft warm and comfortable

Originally posted on marksandspencer.com (UK)

Gorgeous soft and warm thermal top. Quite a snug fit in my usual size. Washes well and keeps it shape

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

14 March 2026Veronica elf

Nice and cozy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Love the quality of these thermal tops and they look great too you can wear them as a top or layer them to keep you extra toasty😊

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

13 March 2026Liz in Devon

Brilliant for cold winter days

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

This garment is surprisingly useful for cold days. It totally blocks out the chill whilst fitting snuggly and stylishly. When paired with similar coloured trousers it is wonderfully slimming. I wear it with a contrasting gilet and the whole look is really “put together.” I love it. Style paired with total comfort.

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 March 2026RTB82

Ideal thermal

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Good quality, warm and competitively priced as an additional body warmer

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

12 March 2026Devon incomer

Excellent quality and so warm.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Excellent quality and so warm. I now have three. That speaks volumes.

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 March 2026Daisydid

Toasty warm and comfortable!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought this in the sale having previously always bought these because they’re such good quality and they are thermal and really help. I feel the cold more now I am older, but these have really saved me. Use them as a T-shirt under the jumper and you’ll be amazed.

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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