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M&S

Heatgen™ Medium Thermal Mock Neck Top

£17

Colour

Customers say:

Fits true to size()
Size

Free standard delivery over £60

Product code: T329223

About this style

This long-sleeved thermal shirt features our innovative Heatgen™ technology, offering medium-level warmth without adding bulk. The mock neck design provides extra coverage and comfort, while the stretchy fabric ensures a close yet flexible fit that works perfectly as a base layer for layering. Exceptionally soft against the skin, this item from the M&S Collection moves with you throughout the day. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

Details & care

Item details

Model Height: 5ft8"/172cm

Model is wearing size: 8

Style

Added Stretch

Features

Heatgen™ technology

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

Composition

55% acrylic, 39% viscose and 6% 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 (186)

4.6

69% Recommended this product

Mentions
12 January 2026Nic0001
Verified Purchase

Very happy

Yes, I recommend this

Quite long in the leg and arms, but not too long, so just right. Really beautiful and soft. Very happy

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

10 January 2026Christmashelper
Verified Purchase

Very warm but have reservatons

No, I don't recommend this

Neck doesn’t sit well and no indication as to which is back or front

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

09 January 2026Youthful65
Verified Purchase

Very pleased!

Yes, I recommend this

Warm & comfortable and the small turtle neck sits well above round neck jumpers. Wish there were more colours.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

08 January 2026GSM South Wales
Verified Purchase

Warm and Comfortable

Yes, I recommend this

I am very pleased with my thermal top, it is warm and comfortable, fits nicely and washes well.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

08 January 2026Finishedwork
Verified Purchase

Not bulky.

Yes, I recommend this

Pleased with this top. Not worn it in really cold weather yet but hoping it will be snug and warm underneath other layers. Not too bulky either.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

06 January 2026Aighear
Verified Purchase

Amazing top!

Yes, I recommend this

A brilliant, life-saver, of a top from M&S. It is so warm yet thin enough to wear under dresses etc for work. It will make a huge difference to my days up here in the Cairngorms. The neck is relaxed and comfortable enough not to make me feel choked yet snug enough to keep in the heat. I will be buying lots more of these.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

06 January 2026Rowley114
Verified Purchase

Warm and very smart

Yes, I recommend this

I bought this for my daughter in law, she has had 2 before and LOVES them

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

04 January 2026zs4
Verified Purchase

Great quality, thermal top.

Yes, I recommend this

Really lovely top, looks good, I love the mock neck, and great for keeping me warm!

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

04 January 2026ChipPan
Verified Purchase

Warm cosy thermal top

Yes, I recommend this

This thermal top is very soft and warm and feels lovely to wear. I’m enjoying wearing it, it’s well made and I recommend it.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

31 December 2025Jill154
Verified Purchase

Lovely

Like all Heatgem wear this is lovely and warm, perfect fit. Washes well, thank you Marks and Sparks

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

31 December 2025Mb3421
Verified Purchase

Fits so comfortably!

Yes, I recommend this

Really love this too! It fits like a second skin and the fabric is smooth and doesn’t itch! Neckline is perfect! I shall definitely be buying more of them.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

30 December 2025Queen Vic 2
Verified Purchase

Good layering piece.

Soft, cosy and warm. Suggest going up a size or two as quite a snug fit. Generous hip length and nice long sleeves. Good value.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

29 December 2025tallady
Verified Purchase

Sumptuously soft thermal top

Yes, I recommend this

Sumptuously soft turtleneck thermal top, neutral colour, washes well

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

29 December 2025Kilie1
Verified Purchase

Lovely and soft and definitely keeps me warmer .

Yes, I recommend this

Versatile as an under layer or as a top , nice variety of colours. I bought 3 .

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

29 December 2025Drawmaster
Verified Purchase

Wish M&S would finish these off properly.

No, I don't recommend this

Nice coloured mock neck heatgen thermal to add to my collection. Excellent as an additional warmth layer during cold spells. However the mock neck and the fact that it is not stitched down seriously detracts from the product. I have mock neck tops from a couple of years ago where the mock neck was stitched down and they look far better than the ones M&S are currently churning out.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

28 December 2025Honey pet 25
Verified Purchase

Not quite!

The top is comfortable and warm and a nice colour. However if worn under any other top the neck shape doesn’t work, it’s neither one thing or another. A turtle or polo neck works much better.I feels as if you are cutting down on style for the sake of cost.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

27 December 2025JoBuchanan
Verified Purchase

I love heatgen, but maybe not the lighter colours

Yes, I recommend this

Minus 1 star because the light colours show creases badly! Only ever had black heatgen before, so never really noticed. Bought this colour to match with the heatgen joggers. Look fab, but both come out of the wash terribly creased. It just seems wrong to be ironing thermals, but that might just be me!!

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

25 December 2025Donnerhall
Verified Purchase

Good quality

Yes, I recommend this

Lovely colour; fits snug and really warm and cosy for the winter months .

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

24 December 2025Greto64
Verified Purchase

Hestgen medium thermal

Yes, I recommend this

Really like this colour great. Looks good under a jumper and comfortable. Will buy more colours.

Helpful?

18 December 2025Penny May
Verified Purchase

ABSOLUTE RUBBISH

No, I don't recommend this

Don’t bother with this top if you want a product that keeps you warm.

Helpful?

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