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Heatgen™ Medium Thermal Leggings

Product code: T327300B

About this style

These thermal leggings provide a cosy base layer to keep you warm on chilly days. Their Heatgen™ technology combines effective insulation with a soft, lightweight material that feels good on your skin. Added stretch ensures easy movement, while stirrups at the bottom hold everything in place. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

M&S

Heatgen™ Medium Thermal Leggings

€23

Colour

Size

Free standard delivery over €75

Reviews (87)

4.7

80% Recommended this product

Mentions
16 March 2026Capybara24

Warm enough for Iceland!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I bought these to go under waterproof trousers for a holiday in Iceland in winter. They were super comfortable and kept me toastie warm.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

02 March 2026chance1

Great quality and price

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

They are superb quality and an affordable price. Well worth buying

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

11 February 2026Three times a lady

Great fit

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Love these leggings, keep their shape after washing and comfortable to wear.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

03 February 2026MonWad

Great product

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great quality as always, just what I needed. Will last well and keep me warm in the colder months, very comfortable.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

01 February 2026terreros

Warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

They are warm but the stirrup is too long, the fit is fine

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

25 January 2026DViv

Nice product

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Stirrups are helpful. Stop leggings riding up during use

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

24 January 2026F McD

Poor Quality

Originally posted on marksandspencer.com (UK)

Very thin material even although they were meant to be brushed cotton on the inside for thermal warmth. Also they were far too long on the legs.

Reviewer Ratings

How do you feel about the size?

Very large

Helpful?

Reviewer Ratings

How do you feel about the size?

Very large

23 January 2026AngieH123

FANTASTIC THERMAL LEGGINGS

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very warm and comfortable thermal leggings. The stirrups make it much easier to layer them under trousers. I'm a size 12 and they are a perfect fit for me. They wash well and dry fast. They seem to be very good quality. I will buy some more. I wish they made socks in the same fabric.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

04 January 2026RedMushroom26

Warm and comfy

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Great for dog walking or shopping, can be dressed up or down

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

31 December 2025Jill154

Perfect

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Just love these, sooo comfy and warm, perfect fit wash great

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

21 December 2025Oui 1

Like the stirrup

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Happy with the medium thermal but would buy another pair if they did thicker ones.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

12 December 2025cozzy

Amazing fit

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great quality, and the fit is spot on. Great value and they look a treat on. Fast deliver and as always, packed well.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

01 December 2025Bethan1809

Not for shorties!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I bought these as I have joined a walking group but unfortunately they are made for much longer legs than mine at 5’2”. However, unfortunately I got rid of the packaging- bin day- so I gave them to my daughter-in-law. She is a few inches taller and absolutely loves them.

Helpful?

01 December 2025Wilmacarstar

You need these!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought a couple of pairs again this year because I lived in them last winter. Soft, stretchy and warm, but not bulky. I love stirrups and have them put on lots of leggings because they stay put under long boots. If you wear Regular length, you're in luck, but I'd love to buy short/long for family and friends. Different colours would be a bonus too!

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

01 December 2025A Atter

Fit well, not sure they'll last long

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

The fit and feel of these leggings is lovely, I have washed them once and they seem to have lost some elasticity and general 'fluffy' feeling already. They have also bobbled already despite only being worn and washed once.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

26 November 2025Sportscar

STYLISH LEGGINGS

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I love these leggings. They sit perfectly inside ankle boots. Size is just right and the length too. 12 Regular. Very warm and comfy. Would recommend these leggings.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

26 November 2025Busymumtoteenagers

Great!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Warm and cosy! They did become a bit bobbly but that wasn’t a problem.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

23 November 2025Syl01

Warm and comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely warm leggings, very soft and comfortable. I bought 2 pairs to see me through the winter months. Worn them under my trousers and they were very comfy and warm.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

23 November 2025Green51

Warm & cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very pleased with these leggings, I was hoping they’d be thicker but after wearing them I’m very impressed. So warm, cosy and very comfortable.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

19 November 2025moomintroll

Excellent value

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Can’t be without my M&S thermals leggings so warm and comfy to wear. Easy wash dry fast.

Reviewer Ratings

How do you feel about the size?

True to size

Helpful?

Reviewer Ratings

How do you feel about the size?

True to size

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