Update your browser for a better shopping experience!

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

2 Pack Heatgen™ Light Thermal Long Sleeve Tops

Product code: T149482

About this style

These lightweight thermal tops balance warmth with everyday comfort. Cut to a regular fit, our Heatgen™ technology provides warmth for cooler days, making them ideal as a base layer. The long sleeve design with Flexifit™ technology allows for ease of movement while preserving the garment's clean lines. Soft seams and heat-sealed labels add comfort against the skin. The moisture-wicking fabric ensures day-long freshness, perfect for layering under your favourite white or black shirts. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

Light warmth for cooler conditions and everyday comfort.

Details & care

Style

Regular fit

Features

Heatgen™ technology

lightweight and supersoft, designed to keep you warm when the weather gets chilly

Composition

38% acrylic, 29% cotton, 29% viscose and 4% elastane (exclusive of trimmings), Ribbing - 39% acrylic, 30% cotton, 29% viscose and 2% elastane

Care

Wash at 40°C

Do not bleach

Tumble dry low temperature

Iron at medium temperature

Do not dry clean

M&S

2 Pack Heatgen™ Light Thermal Long Sleeve Tops

£28

Colour

Size

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

Reviews (922)

4.6

68% Recommended this product

Mentions
04 July 2026
Verified Purchase

10 out of 10

Yes, I recommend this

For spring/autumn days, this is just the right thickness of under garment which keeps you very comfortable, not too hot & not too cold, perfect in fact & lovely feeling fabric too.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

03 July 2026Honey001
Verified Purchase

Good quality.

Yes, I recommend this

Bought these for my son as he loves them, warm but not too thick. They are a good length and wash really well.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

02 July 2026Mariava
Verified Purchase

Great quality

Yes, I recommend this

Great quality. Wash well. This is a repeat purchase. Also good value for money.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

22 June 2026Joan the boan
Verified Purchase

Great design

Yes, I recommend this

I bought these for my husband who likes the soft material and colour. He wore this top under a suit for an event and it looked very cool.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

29 May 2026Awesome3
Verified Purchase

Warm and comfy

Yes, I recommend this

Bought for my elderly dad. He’s happy with them as they keep the heat in and the cold out.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

26 May 2026Tonka142
Verified Purchase

Warm and cosy so I am told! Light to pack.

Yes, I recommend this

Warm and comfortable, easy wash and quick to dry as well.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

09 May 2026Vespertine
Verified Purchase

Excellent alternative to heavy winter thermals.

Yes, I recommend this

Husband needed a lighter, long sleeved vest to wear during the months leading up to summer. These vest are so comfortable, and the silky fabric gives ease of wear under shirts and jumpers. Very happy with these vests. Good value as well.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

24 April 2026Jacquie 2
Verified Purchase

Superb comfort

Yes, I recommend this

My husband says these are the best he can buy,superb comfort

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

21 April 2026Sissy55
Verified Purchase

A good fit

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

Helpful?

18 March 2026AnonRob
Verified Purchase

Comfy

Yes, I recommend this

Comfortable like the stretchy fabric and long arms and body which allows me to undersize for a snugger fit

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

12 March 2026c0nc0rde4
Verified Purchase

would recommend

Yes, I recommend this

I have purchased these items many many times, and would so again.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

09 March 2026AffinityInspiration
Verified Purchase

Perfect for winter warmth

Yes, I recommend this

I've purchased these late in Winter, but they are warm as toast. Just right for my trip to Oslo and Bergen in September. Im very happy with these.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

08 March 2026Happy Eva After
Verified Purchase

Perfectly warm and comfortable!

My husband LOVES these. He wears them under his t shirts and they keep him toasty despite them being the lightweight version.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

05 March 2026Ray211
Verified Purchase

Comfy

Yes, I recommend this

These tops are very comfy and warm, that fit well and are stylish

Helpful?

02 March 2026Panita
Verified Purchase

light, soft, comfortable

Yes, I recommend this

Just right under shirts/t shirts in colder weather. would also be good as tops to sleep in.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

01 March 2026Mmmmm11111
Verified Purchase

Great item

Originally posted on marksandspencer.ie

Yes, I recommend this

It’s our second purchase, they last forever and they so nice feeling to the body

Helpful?

01 March 2026One More Grumpy Old Man
Verified Purchase

Sizing not accurate

These new versions are not as good as previous designs. Small size is more like medium. They don't hug your skin as thermals ought to.

Helpful?

21 February 2026CBailey13
Verified Purchase

Wash and dry really well in the dryer.

Yes, I recommend this

My husband reels the cold with being on 2 blood thinners. These keep him lovely and warm without being too thick to wear under his shirt. The wash and dry well l without the need to iron. They don’t shrink either. He has the short sleeved ins as well as the long sleeved ones. Perfect for a cold winter.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

19 February 2026Debibee
Verified Purchase

Do not recommend

No, I don't recommend this

Bad quality very thin and loose over priced for quality

Reviewer Ratings

Comfort

Poor

Helpful?

Reviewer Ratings

Comfort

Poor

18 February 2026IanGP
Verified Purchase

Recommended

Yes, I recommend this

Needed light undershirt for outdoor actives. Good long length and comfortable to wear. Wash really well

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

1 of 154