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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

Reviews (1008)

4.8

72% Recommended this product

Mentions
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

10 March 2026Pintail6900

Quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Quality is good and they are warm with the material having a soft feel on the skin

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

08 March 2026Mumofthreetwoboysonegirl

Super warm-actually work!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Super warm, the only thermals that actually work! Going to be a second set as they do what they say.

Helpful?

05 March 2026jellybeanjuice

never changed the design in years

Originally posted on marksandspencer.com (UK)

Underwhelmed not very appealing to the younger generation

Helpful?

04 March 2026Eliza44

Super warm thermal

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought this for my son who works on an oil rig in Scotland, in freezing conditions. According to him he described the top as worth its weight in gold!

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

03 March 2026Joe290

Go thermal

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Delighted with these latest thermal tops. I have worn M&S thermals for many years and believe these are the best. Very warm, comfortable and good value, they have laundered well.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

03 March 2026Brysharth

Happy repeat customer

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Not the first time purchased and no surprises. Solid item each time

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

28 February 2026Confusedattheability

Great qualitt

Originally posted on marksandspencer.com (UK)

Great layer. Really long so covers your butt, no riding up and definitely winter warm. A little expensive but for me worth it.

Helpful?

28 February 2026SusieMul

Very good thermal vest

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great quality and very warm. Soft and comfortable, sizing accurate.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

25 February 2026Brabie

Keeps my husband nice and warm.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

My husband really likes this thermal long sleeved top as it has kept him nice and warm. Easy to wash.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

23 February 2026Mandsupershop

Men’s Thermaltop

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

An excellent addition to any wardrobe in the cooler months and I suppose the only layer you really need. Super soft, washes really well and like new every time

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

19 February 2026long sleeve

Heatgen™ Maximum Thermal Long Sleeve Top

Originally posted on marksandspencer.com (UK)

They are great at keeping warm especially in the cold weather

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

19 February 2026Nicolita21

Lovely thermal top for skiing

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought for skiing. The black looked very smart. Very soft and great quality for the price. Would definitely buy again

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

18 February 2026ShebaDog7

Very good indeed

Originally posted on marksandspencer.com (UK)

I bought it for my husband who feels the cold , & he hasn’t moaned since !

Helpful?

18 February 2026Stevo33

Good quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I have previously bought the short sleeved and would recommend for warmth and feel

Helpful?

17 February 2026Clive Phillips

Thank you always is perfect for bad weather Clive

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Perfect for extremely cold and freezing temperatures and cold weather usually buy every year if needs be.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

16 February 2026Rol77

Very warm, good fit, fast delivery.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Arrived quickly, fitted me perfectly and very comfortable and warm on

Helpful?

14 February 2026sltofdevon

Great vests.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

This is the second time we’ve purchased these vests. My husband feels the cold and finds them very comfortable and warm.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

11 February 2026Kammie

Warm and cosy top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I bought the ladies version of these and the matching leggings for wearing under my walking clothes and coat when walking the dog. I loved them that much I bought my husband this one and he loves them too.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

09 February 2026Newshoehappy

Good quality warm vests

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

My husband loves these vests when he is playing golf, they keep him warm and still look smart under his golf tops.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

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