Update your browser for a better shopping experience!

Get faster load times, stronger security and access to all features.

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, otherwise €4.50

Reviews (1128)

4.7

71% Recommended this product

Mentions
10 November 2026Stumpie1

Comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Best thermal vest I’ve found for comfort and style

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

08 November 2026Cheshire Man

Warm vest

Originally posted on marksandspencer.com (UK)

Very good in keeping the body warm, even in very cold conditions!! I also use one, (or two!), as a base layer(s) when cycling!

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

06 November 2026Monroe 53

Warm and comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought two of these for my husband to add extra warmth under his top layer but he's been wearing them on their own! They are certainly warm and comfortable. They wash well but they do bobble a bit hence four stars and not five.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

06 November 2026

Poor quality cotton thermal

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

I think this year’s long sleeve cotton thermal is the worse quality I have worn, which spans many years. And, this is the first time it was not made available to buy inside M&S store.

Helpful?

04 November 2026Titanica

Get these every year

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Winter must-haves. From November to March only tops I wear. Wash and dry OK.

Helpful?

03 November 2026Hollyharps

Great quality but large to size

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

The quality and fit are great, although quite large to size.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

03 November 2026Kate0007

Great quality and sizing

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Excellent quality and the sizing is great. Snug even to keep warm but roomy enough so it doesn’t feel tight.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

01 November 2026Julia 69

Very warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought these for my husband , he feels the cold from being poorly. He said they are good quality & very warm.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

01 November 2026Tanny22

Great thermals

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Husband wears this in winter, soft, warm & comfortable

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

31 October 2026Thistledown1

Cosy vest

Originally posted on marksandspencer.com (UK)

Bought for my son who watches lots of his children’s football games during the winter. Says it’s soft and warm.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

29 October 2026Noshea

Men’s thermal top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I’m a 5’11 female and I struggle to find a good basic white top to layer under my jumpers that’s long enough in the body and arms so that it shows under my jumper. This definitely fits the bill. Not the warmest thermal top I’ve worn, bit a good base layer

Helpful?

26 October 2026Snickett

Ticks all boxes

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought for myself as find the women’s thermals too clingy on the arms which makes it difficult to roll up when necessary and is not a sensation I like. Chose the men’s size small (I’m a size 14). Loose but comfortable fit and a much longer length than the women’s thermals. Sits well under T-shirts or jumper and great for gardening. Washes well and more importantly dye from the wine coloured top does not run.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

25 October 2026warwickshire1

Just the job

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Had one last year and wouldn’t be without one.Good quality and comfortable.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

24 October 2026rusty162

Stay Warm

Originally posted on marksandspencer.com (UK)

Like many older people staying warm is more important than fashion

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

24 October 2026fusion

Hubby’s fave

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

What can I say? The man likes to keep warm in the colder months. And this does the job every year. Would buy more if it EVER goes on sale.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

23 October 2026Fas fb jk

Ggg

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I buy these thermal vests every winter. They are soft and warm and perfect for the chilly Scottish weather

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

14 October 2026Henrie58

Perfect mid thermal vest.

Originally posted on marksandspencer.com (UK)

Bought these for my elderly husaband and he loves them.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

09 October 2026smoggybird

Great warm top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Hubby loves them. Got him grey and burgundy and he asked for another 2 in same colours. Great fit and very cosy

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

08 October 2026JanoJayJay

Soft and warm thermal

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Thicker warmer thermal top ideal for outdoor activities

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

04 October 2026Chrissy comfort

Excellent top

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

My husband loves these tops brilliant for going to watch football in the winter months.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

1 of 188