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Heatgen™ Medium Thermal Long Sleeve Tops

Product code: T148813N

About this style

For warmth on colder days, this thermal long sleeve top features our innovative Heatgen™ technology for medium-warmth comfort. The regular fit allows for easy layering as a baselayer, while the stretchy ribbed neck ensures a comfortable fit. Featuring supersoft seams and insulating brushed back fabric for maximum comfort when temperatures drop, making it an ideal base layer top for cold weather. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

Medium warmth for wrapping up in moderately cold conditions.

M&S

Heatgen™ Medium Thermal Long Sleeve Tops

€26

Colour

Size

Also available in: Long Johns and Short Sleeve
Free standard delivery over €75

Reviews (1097)

4.7

71% Recommended this product

Mentions
15 March 2026Mand1000

Great Thermal

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought for my son who loves it. It’s very warm, washes well and dries quickly. He is now saying he’s going to buy another himself as it’s made a difference in the cold.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

11 March 2026AnonBear

Great quality, nice and warm.

Originally posted on marksandspencer.com (UK)

Have had positive feedback from my son & Dad about these. Son wears for skiing, outdoor pursuits & wick well. Dad wears as extra warm pjs.

Helpful?

09 March 2026Pompomrach

My son loves these tops

Originally posted on marksandspencer.com (UK)

I have bought these for many years and the quality is not the same unfortunately.

Helpful?

26 February 2026Junglebunny25

Excellent thermal

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great quality thermal. Very warm when it is really cold outside. Fits really well. Great price and good service .

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

26 February 2026Bettysweaty

Soft and comfy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

mens thermal T, for a woman, nice length, much prefer to woman’s version which feels too short for longer body. Beautiful soft wash up nicely.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

18 February 2026Phil 68

A big medium

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

HAVE BOUGHT 2 PREVIOUS, THIS ONE IS RATHER SLOPPY.

Helpful?

14 February 2026SheCanDance

Very good quality

Originally posted on marksandspencer.com (UK)

Love long body and really warm. I choose to wear men’s tops for winter because as a tall woman I often find ladies tops a bit short.

Helpful?

14 February 2026Marion4

Heatgen Thermals

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

My husband feels the cold a lot since he has got older and these thermals have meant he can still potter around in his shed. They fit him a treat and the main thing is they keep him warm

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

10 February 2026Ronossie

Warm as toast

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely and warm nice feel not itchy like some thermal wear! Found the fit came up large for the size as base layer clothing needs to be reasonably tight to enable layering! Well made good price but if the fit was better would have given 5 star review!

Reviewer Ratings

Comfort

Good

Helpful?

Reviewer Ratings

Comfort

Good

09 February 2026Susanj1951

Thermal long sleeve vest

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely vest, warm and cosy. Excellent quality and good value for money quick delivery

Helpful?

07 February 2026Ddddh

Good quality and perfect for sleeping in

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great for sleeping in bed. Provides just the right amount of warmth and is made out of very comfortable material.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

06 February 2026Clay03

Keeping warm on a very cold day.

Originally posted on marksandspencer.com (UK)

Brilliant for keeping warm in really cold weather.

Helpful?

05 February 2026Amelia62

Nice and warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great thermal vest for warmth without bulk. Great as a PJ top too

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

03 February 2026Tom at desertwinds

Exceptional.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Superb texture, feel, softness and warmth. There's something very clever about that material. Claims to just be cotton but it dried quicker than my cottom vests after washing.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

02 February 2026Netty77

Over sized.

Originally posted on marksandspencer.com (UK)

I ordered a size large it was more like an extra large.

Helpful?

31 January 2026BB1695

Warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Outstanding warm and very comfortable I got a medium size I’m 42 chest and it fits perfectly

Helpful?

30 January 2026MistyMisty

Cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

My husband loves these. He wears them under shirts and sweatshirts.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

29 January 2026Steve from Cheshire

Great quality!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Nice item - soft & warm and easy to wear under a jumper or hoodie

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

28 January 2026South East buyer

Great layer

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Really pleased with this for work. Not excessively hot so ideal for keeping warm while working. Washes well, good quality

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

27 January 2026ShopperMark59

Does what it says it will

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought for general use. Definitely keeps you warmer and is very comfy to wear. Works for overnight too. Easy to clean. Very happy.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

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