Update your browser for a better shopping experience!

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

M&S

Heatgen™ Maximum Thermal Fleece Top

£22

Colour

Customers say:

Fits true to size()
Std Dress Size

Matching items: Thermal Leggings
Also available in: Tops
Free standard delivery over £60

Product code: T329225

About this style

Stay cosy during the coldest weather in our Heatgen™ Maximum Thermal fleece top. The high mock neck and long sleeves provide extra warmth, while the soft fleece with added stretch ensures a comfortable fit. Our warmest thermal technology yet keeps you snug without bulk, letting you embrace winter with confidence. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

Details & care

Item details

Model Height: 5ft9"/176cm

Model is wearing size: 12

Style

Added Stretch

Features

Heatgen™ technology

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

Composition

55% acrylic, 37% viscose and 8% elastane (exclusive of trimmings)

Care

Wash at 40°C

Do not bleach

Do not tumble dry

Do not iron

Do not dry clean

Delivery, collection & returns

Delivery

Standard

UK Standard Delivery is available for £3.99 or free on orders over £60 (excluding furniture).

Nominated Day

UK Next Day Delivery and UK Nominated Day Delivery (excluding Northern Ireland) are available for £5.99 (excluding furniture)

Collection

Collect from store

Store collection is free on all fashion, home and beauty orders.

Returns

UK returns

Free

Exclusions apply

Full delivery and collection informationOur returns policy

Reviews (627)

4.5

68% Recommended this product

Mentions
07 December 2025Louie101
Verified Purchase

Cosy and comfortable

Yes, I recommend this

Cosy and comfortable piece for winter layering - good value purchase

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

07 December 2025wilma1922
Verified Purchase

Warn and cosy

Yes, I recommend this

Neck shape a little unusual however this top is fantastic and so warm - so impressed that I have bought one in each colour for winter - a must have .

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

07 December 2025Jug9
Verified Purchase

Very warm indeed

Yes, I recommend this

Super soft and great quality. They feel very warm indeed

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

06 December 202516JW06
Verified Purchase

Excellent product

Yes, I recommend this

Excellent product. I always order a size bigger than my usual fit, when I order thermal tops as I find it more comfortable. This product was a snug fit but not too snug & so soft. The colour choice was really good. I would definitely recommend this product.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

06 December 2025Yh12345
Verified Purchase

Lovely and warm

Yes, I recommend this

Great quality thermals. Bought these for a trip to Finland and have helped keep me warm. I sized up, which I’m glad I did. The only thing is I wish there was a label inside so you could tell which way was the front or back.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

05 December 2025Old Woman 60
Verified Purchase

Fantastic product from Marks

Yes, I recommend this

At last! A higher necked thermal. I live a die in these but struggle with the scoop neck as it often leaves me cold and exposed. I love them as outer wear under a fleece or cardi and feel the higher neck complements what I’m wearing like a long sleeve t-shirt. They are also super warm and soft to touch. I would recommend going up a size as they do feel quite tight on.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

04 December 2025Cor55
Verified Purchase

Would recommend.

Yes, I recommend this

Since losing a lot of weight I now feel the cold. This top really helps me to keep warm, is comfy to wear and good quality. Would recommend.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

04 December 2025Toweroflondon
Verified Purchase

Cosy vest/t-shirt

I love these cosy almost turtle neck vests. They can be used to keep you warm and/or as a top on its own. Fits beautifully (14)

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

04 December 2025Bren16
Verified Purchase

Lovely and warm

Yes, I recommend this

Lovely and warm, soft and comfortable. A good fit a little long but I am short

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

04 December 2025welshwinter
Verified Purchase

Good quality fabric but not nice shape neckline

No, I don't recommend this

Although cannot fault the quality and thickness of the material the neckline is not as good as past thermal tops where the neckline is lower. This crew neckline is very manly, so much so I have passed the tops on to my husband to wear and they look great. The mens max thermal are ribbed and all of his have pilled and are not as good a fabric as the womens max heat.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

04 December 2025tizabeth
Verified Purchase

Warm

Yes, I recommend this

Love these tops (although a few more colours would be welcome!! Lovely and warm & comfortable to wear.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

04 December 2025Anne Mac scout
Verified Purchase

Keep warm

Yes, I recommend this

The best thing for feeling walm and cosy. Wear under clothes or just wear them as a top. Many colours but would appreciate more, dark green navy for example.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

03 December 2025Lily the Pink20
Verified Purchase

Winter warmth

I always buy these for the winter I much prefer this type of neck too. Looks good under a jumper. Wish they had brighter colours or patterns though.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

02 December 2025ElizaDoLotsandLots
Verified Purchase

Great base layer. Blah blah fill up word count

Yes, I recommend this

Toasty & comfortable. Washes well. Blah blah fill up word count

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

02 December 2025Loopylou08
Verified Purchase

Great quality super soft and fits perfectly

Yes, I recommend this

So soft fits perfectly and is not uncomfortable really warm

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

02 December 2025Matildacat
Verified Purchase

Winter essentials!

Yes, I recommend this

Just what I need, once summer slips into autumn. M&S thermals are really warm and snug; they feel quite thick without being bulky, probably because they are brushed on the inside. I wouldn’t be without them, and each year I add to my collection, whilst giving older ones to a local charity…

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

02 December 2025Teapot007
Verified Purchase

Hot Stuff.

Yes, I recommend this

Lovely and warm and well worth the monies. Would recommend to friends and family.

Reviewer Ratings

How did it fit?

A bit large

Helpful?

Reviewer Ratings

How did it fit?

A bit large

02 December 2025Peterson12
Verified Purchase

Very warm and a decent thickness

Yes, I recommend this

Nice shape and very warm. A little snug for me - would prefer a bit more room

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

01 December 2025Maggiestov
Verified Purchase

Very toasty !

Yes, I recommend this

I bought the 20 ( usually an 18 in Marks) and it was still ‘snug’ as thermals tend to be . Extremely warm !! Needed for minus temperatures in Berlin and it definitely did the trick !! Love the olive green colour and slightly raised neckline keeping my neck warm.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

01 December 2025Somersetbuyer
Verified Purchase

So warm

It's really thick and warm, fits well and is perfect for the winter!

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

1 of 105