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Heatgen™ Maximum Thermal Long Sleeve Top

Product code: T147404W

About this style

This warm thermal baselayer top combines effective heat retention with everyday comfort. The regular fit with stretchy ribbed neck and cuffs keeps its shape, while the long sleeves provide coverage for cooler winter days. Perfect as an undershirt or standalone layer, it's made with 35% natural fibres for insulation and featuring Heatgen™ technology that retains body heat in cold conditions. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

Maximum warmth for keeping cosy in colder climates.

M&S

Heatgen™ Maximum Thermal Long Sleeve Top

€36

Colour

Size

Also available in: Long Johns and Vest
Free standard delivery over €75, otherwise €4.50

Reviews (1028)

4.8

72% Recommended this product

Mentions
24 October 2026rusty162

Warm and Cosy

Originally posted on marksandspencer.com (UK)

Happy with this purchase as it is getting close to that time of year. A bit expensive but necessary.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

22 October 2026briggsgirl

Exactly as described.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Product exactly as described and keeps my husband warm as promised. Arrived in store on time.

Helpful?

21 October 2026Racing Snake

Happy husband

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Warm, comfortable and fits well. A much needed winter wardrobe staple.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

21 October 2026MoJo45

Excellent

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I ordered these for my husband who being elderly feels the cold. Felt as made with wool content should be warmer than ordinary thermal tops. Very pleased and wash well too. Worth the extra expense

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

21 October 2026samwonderfulmother

Nice and warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Hubby loves this thermal top it's nice and soft fabric and just right for the colder weather. Washes well and will be buying another. Bought his usual size large and fits well.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

09 October 2026Richardo 180

Heatgen for a warm body in chilly weather

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I have just turned 93 and I really do feel the cold when it get chilly. This garment is absolutely super at keeping my body warm and I am ordering three more.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

21 August 2026Just_Me_2026

Excellent, thank you.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Excellent product and service, thank you very much.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

28 July 2026Knolly1955

Mend thermal

Originally posted on marksandspencer.com (UK)

Very nice and soft a bit overpriced For a vest Not sure if I would buy again

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

12 June 2026Pabs12

TOASTY!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

TOP-TOP TOASTY TOPS - TRY TOPPING TASTY TOPS!!!!!!

Helpful?

08 June 2026Mike159

Quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Excellent quality very comfortable and a perfect fit as per my order

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

26 May 2026tusesq

At Last I have found a product

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Good quality product even in summer I need the thermal quality due to age and a medical condition

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

26 May 2026cath 113

excellent quality

Originally posted on marksandspencer.com (UK)

my husband has a few of these vests ,they are very comforable and warm to wear without being bulky.also wash really well

Helpful?

05 May 2026betsy4blue

A warmer base layer

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I needed a warmer base layer, to keep my husband warmer.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

21 April 2026Sissy55

Fit well.

Originally posted on marksandspencer.com (UK)

Bought for my husband, who is happy with the fit. Unable to test them until later in the year when we go skiing.

Helpful?

04 April 2026Ade2727

Body too long

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Nice n cosy but body is far too long. Would suit someone 7' tall. I'm 5'11, XL size for comfort, fits great but it shows unless you tuck it all in!

Reviewer Ratings

Comfort

Average

Helpful?

Reviewer Ratings

Comfort

Average

03 April 2026weezie9

Warm as expected but a fluff magnet

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Bought this for hubby who works outside. He’s happy that it keeps him warm and it’s a good fit. The only downside is that it’s a fluff catcher, picks up everything! I would maybe expect this from a cheaper store but not M & S!!

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

03 April 2026Jed78

These vests are superwarm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought for a gift for a relative who was very pleased with it, as it’s superwarm

Helpful?

26 March 2026Belcia

Brilliant for cold weather

Originally posted on marksandspencer.com (UK)

I purchased the long sleeve thermal tops and I have to say, this was the best choice. Very warm, comfortable and perfect fit. I would highly recommend it.

Helpful?

21 March 2026Long 80 Legs

Warm and comfortable

Originally posted on marksandspencer.com (UK)

Excellent, my husband was resistant to wearing these vests but I’ve had to buy more as he now wears them constantly. Our only wish is that the necks were slightly lower so the vest wouldn’t show under shirts. The quality and price are good and they wash very well.

Helpful?

13 March 2026MGamal

Good quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

good fabric; could have been more insulated though; compared to uniqlo. Please work on a designs with wider neck so it doesn't pop out from shirts

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

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