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M&S

Heatgen™ Maximum Thermal Long Sleeve Top

£28

Colour

Size

Also available in: Long Johns and Vest
Free standard delivery over £60

Product code: T147404W

About this style

This warm thermal baselayer top combines effective heat retention with everyday comfort. The regular fit with stretchy ribbed neck and cuffs keeps its shape, while the long sleeves provide coverage for cooler winter days. Perfect as an undershirt or standalone layer, it's made with 35% natural fibres for insulation and featuring Heatgen™ technology that retains body heat in cold conditions. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

Maximum warmth for keeping cosy in colder climates.

Details & care

Style

Regular fit

Features

Thermal

Soft and cosy brushed fabric that keeps warmth in

Heatgen™ technology

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

Composition

35% wool, 26% polyester, 23% viscose and 16% polyamide (exclusive of trimmings)

Care

Wash at 40°C

Do not bleach

Tumble dry medium temperature

Iron at low temperature

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 (938)

4.8

72% Recommended this product

Mentions
13 January 2026Jasperlyn
Verified Purchase

Perfect

Yes, I recommend this

Great quality and online purchase faultless would recommend

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

12 January 2026Snuggly25
Verified Purchase

Christmas present

Yes, I recommend this

I bought it for my son and he is very pleased with it. He said it was soft, comfortable and not to heavy.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

12 January 2026Welbelted
Verified Purchase

Nice warm thermals

Bought for my husband who is always cold. Keeps him nice and warm

Helpful?

11 January 2026Linda FS
Verified Purchase

Great quality

Yes, I recommend this

Bought this as a gift for someone and they are very happy with the quality and warmth of the material, keeping them very cosy. It is great value for the price.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

11 January 2026Jam6263
Verified Purchase

Spot on and toasty

Yes, I recommend this

Like their matching bottoms good and warm with no awkward seams. Good length in body and arms so no cold spots

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

10 January 2026TheRocketman
Verified Purchase

Ultra warm but bobbles

Yes, I recommend this

Ultra warm so great value for money compared with hi-tech vests from sports manufacturers but develops pilling and bobbles after a few wears.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

10 January 2026purleywurley
Verified Purchase

Good quality and does the job.

Yes, I recommend this

Purchased this for husband who was feeling the cold. He put it on immediately and was very pleased with the comfort and warmth it provided. Especially liked the generous length and sleeves which actually fitted his long arms. Trouble now is getting him to take it off !

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

08 January 2026GRMK
Verified Purchase

Warm

Yes, I recommend this

Bought for husband who is very positive about it, says it is warmer than other thermal tops he has had in the past. One thing to note, the body is very long (not an issue) but the very long arms are annoying.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

06 January 2026Atrium6
Verified Purchase

Cosy

Yes, I recommend this

Bought this because it is winter. Very pleased with the fit and feel.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

06 January 2026Nacer10
Verified Purchase

Long sleeved thermal top

Yes, I recommend this

Purchased for husband who feels the cold badly due to medication, he found them super warm and soft. Great quality

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

31 December 2025Wizzywiff1
Verified Purchase

Good quality vest

Yes, I recommend this

Good fit, washes well but only four stars because despite its price and the fact it contains wool it doesn’t keep my husband noticeably warmer than cheaper thermal vests.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

31 December 2025
Verified Purchase

Aged

Yes, I recommend this

On my way to 93 years of age, I find with ill health I feel the cold very much, my son and his partner bought me a set, and I then ordered another set.

Helpful?

31 December 2025HughLo
Verified Purchase

Ideal for cold weather.

The top is comfortable and warm to wear. The cut is generous and fits me well.

Helpful?

30 December 2025Gog the Mild
Verified Purchase

Highly recommended

Yes, I recommend this

I got black. A repeat purchase. Good fit, very warm and snug.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

30 December 2025moggyphile
Verified Purchase

Needs more wool!

Yes, I recommend this

I bought the other bit as well. It has a small amount of wool in it and is very warm, but quite heavy as a base layer. It is also pricey, especially if you want top and bottom.

Reviewer Ratings

Comfort

Average

Helpful?

Reviewer Ratings

Comfort

Average

30 December 2025Jojaja
Verified Purchase

Great product. Warm and toasty!

Yes, I recommend this

Great product. Warm and toasty! Size is accurate and good fit. Would buy again.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

29 December 2025David 941
Verified Purchase

Good vest

Merino wool is the right base garment for winter- not cotton.

Helpful?

28 December 2025crazycat3187
Verified Purchase

Nice and warm

Yes, I recommend this

Really warm with a good fit. Long but that's fine.

Helpful?

28 December 2025JohnO79
Verified Purchase

Satisfied customer.

The thermal top is very comfortable and provides the protection I was hoping for.

Helpful?

27 December 2025HazzaHornet
Verified Purchase

Expectations fulfilled.

Yes, I recommend this

Advancing age brings on the dependence on thermal clothing including vests. I have several, all different. This one is my favourite. Comfortable, warm to suit conditions and long enough in body and sleeve. (Not always the case with M&S thermals, even if fabric is high quality)

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

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