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Heatgen™ Medium Thermal Crew Neck Top

Product code: T329268

About this style

Made using Heatgen™ Medium technology, this thermal top offers medium warmth for cooler days without feeling heavy. A crew neck and long sleeves complete the simple, non wired shape. M&S designed this top to layer easily under regular clothing. M&S Collection: versatile styles in modern shapes with unique and playful details.

M&S

Heatgen™ Medium Thermal Crew Neck Top

£17

Colour

Customers say:

Fits true to size()
Size

Free standard delivery over £75, otherwise from £3.99

Reviews (89)

4.5

78% Recommended this product

Mentions
15 November 2026Chalks61
Verified Purchase

Nice quality thermal top

Yes, I recommend this

Good solid thermal top, can’t fault it for quality at the price.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

14 November 2026JuliePhil
Verified Purchase

Good quality, warm base layer

Yes, I recommend this

I bought a few of these last winter so added a couple more colours for this year. I find them very useful in the medium weight as they fit easily as a base layer. They are very clingy though so last year I bought them in size 16, this year I opted for the large (I usually wear a 12 or 14 top). I’ve dropped a star on the rating as this year’s ones are shorter than the ones I bought last year, and also previously they were sized 10, 12, 14 etc, now small, medium etc, so the sizing choice is less.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

14 November 2026LDEG
Verified Purchase

Cosy

Yes, I recommend this

Cosy, well fitting, warm and aubergine is a lovely colour!

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

14 November 2026amandajaney
Verified Purchase

Amazing thermal top

Yes, I recommend this

These thermals are amazing!! So soft and cosy and perfect for the change of season.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

14 November 2026Carley_I
Verified Purchase

Fabric needs improvement

No, I don't recommend this

Lovely and soft fabric, however it did pill under the arms after the first wear, which was only for 2 hours.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

14 November 2026Paxto
Verified Purchase

Warm, comfortable top

A comfortable, warm top, which fits perfectly. Ideal for the cold weather we're experiencing.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

14 November 2026Jayjazz3
Verified Purchase

Perfect!

Yes, I recommend this

I needed a long sleeved thermal top for walking outdoors in winter. This fits the bill perfectly. Keeps me warm and comfortable. It's also a good companion to my M&S thermal leggings.

Reviewer Ratings

Quality

Excellent

Helpful?

Reviewer Ratings

Quality

Excellent

14 November 2026Yvo2871
Verified Purchase

Super soft

Yes, I recommend this

Super soft, comfortable and warm. I would go a size up though as quite tight fitting.

Reviewer Ratings

How did it fit?

Small

Helpful?

Reviewer Ratings

How did it fit?

Small

13 November 2026Msdhumphreys
Verified Purchase

Love this ! Warm easy to wear

Yes, I recommend this

Very warm, soft, love it! Easy to layer, would defiantly recommend

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

12 November 2026Puppy girl
Verified Purchase

Great product but new sizing frustrating!

Yes, I recommend this

Lovely colour and thermal quality. However, rather frustrating sizing! Have bought size 10 for years which fits perfectly. Having read sizing advice and reviews which indicated new m and s sizing comes up small, I ordered a size small. Couldn’t believe how tight it was!! Have ordered a medium and await delivery to try it on- fingers crossed! It is frustrating not to be able to have recognisable and consistent sizing when you can’t try on in store. May we have the old sizing numbers back again! Do hope you will act on this!

Helpful?

11 November 2026Scottish Independence
Verified Purchase

Cosy layer for winter

Yes, I recommend this

Cosy base layer, ideal for keeping warm in winter ❄️

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

10 November 2026Moomel
Verified Purchase

A Must in your Wardrobe

Yes, I recommend this

Well....these are just fantastic! So good I bought another one. Not too thick and keep me lovely and warm. They also make a good basic under a shirt.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

10 November 2026Elderly Lady
Verified Purchase

Cosy

Originally posted on marksandspencer.ie

Yes, I recommend this

Perfect for winter to wear under a shirt or a jumper or on its own. I bought three but returning the cream one as it was a very buttery colour. A white version would be much more usable.

Helpful?

10 November 2026AntheaC
Verified Purchase

Disappointingly short despite being cosy.

Nice and soft & feels cosy. But far too short for me so rides up every time I wear it. Disappointing.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

10 November 2026Shella 1
Verified Purchase

Heat gen t shirt long sleeve

Yes, I recommend this

This is the best thermal top I have ever bought I can't believe how warm it is can't wait to get another one

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

10 November 2026GayM
Verified Purchase

Great top and very cosy

Lovely warm top that is not too thick. I have 2 of these now.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

10 November 2026Stephanie Jackson
Verified Purchase

Warm top

Yes, I recommend this

I love this top it’s very soft material so comfy to wear and is warm enough for me. I’m usually a size 12/14 but bought the large size and it was snug so the medium would have been too small. Value for money.

Helpful?

10 November 2026BobbieDee
Verified Purchase

Snug and warm

Yes, I recommend this

Very comfortable and a good fit. Nice colour and it washed well.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

09 November 2026JB94
Verified Purchase

Warm and comfortable top

Yes, I recommend this

Lovely warm top. Top comes up small, I went up to a large, normally am medium. Despite this, the top is warm and comfy and can be worn layered under a jumper. Washes well on gentle wash

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

09 November 2026Jacster1
Verified Purchase

Not as good as before

No, I don't recommend this

I’ve bought these tops every year but the sizing has changed as has the quality. The medium was too small on the shoulders and the large too big all over. The material also had a sheen which I didn’t like so I returned both sizes.

Reviewer Ratings

How did it fit?

Small

Helpful?

Reviewer Ratings

How did it fit?

Small

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