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Heatgen™ Maximum Thermal Fleece Leggings

Product code: T327303

About this style

These thermal leggings offer maximum warmth with our innovative Heatgen™ technology that effectively traps body heat when temperatures drop. The soft fleece lining provides a luxuriously cosy feel against the skin, while the stretchy fabric ensures a comfortable fit that moves with you throughout the day. The clean, streamlined design makes these leggings perfect for layering or wearing alone during colder months. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

M&S

Heatgen™ Maximum Thermal Fleece Leggings

€29

Colour

Out of stock online

Waist

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Matching items: Thermal Fleece Top and Thermal Top
Free standard delivery over €75, otherwise €4.50

Reviews (1232)

4.7

78% Recommended this product

Mentions
02 November 2026Carbur

Warm leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Beautiful soft warm leggings, perfect for this time of year.

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

29 October 2026Miss Nice Lady

Ecvellent

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Excellent well done M&S nice and warm excellent colour but need more colours please

Reviewer Ratings

How do you feel about the size?

A bit small

Helpful?

Reviewer Ratings

How do you feel about the size?

A bit small

27 October 2026Hulagirl

Warm and practical

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I wear these with a matching top for my 6am dog walks. Warm, comfy and practical. In fact, I'm about to buy another pair.

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

27 October 2026CPH57

Soft and Comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Comfortable and warm. Perfect for relaxing in. I may buy another pair.

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 October 2026Nanadg

SO COSY

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Didn't realise these were so thick. Wore them today for the first time, so warm and cosy. Good value for money. The only snag is the length, rather long but I turned the legs in.

Reviewer Ratings

How do you feel about the size?

Large

Helpful?

Reviewer Ratings

How do you feel about the size?

Large

25 October 2026Peterb228

Poor Sizes

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Poor change in sizes now only small/ medium & large, for a size 10 its either too small or too large

Reviewer Ratings

How do you feel about the size?

A bit large

Helpful?

Reviewer Ratings

How do you feel about the size?

A bit large

24 October 2026Nic759

Leggins

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely and soft but would be better if they were produced in different lengths

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 October 2026Polgara60

Warm and stylish

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These are the warmest fleece leggings ever and are super 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

22 October 2026Sue240252

Great leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These leggings are wonderfully comfortable, warm and cosy. They are a good fit apart from the length but legs turn up easily.

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

20 October 2026Jennifer 77

Leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely & soft and so toasty All set for the winter.Price good for the quality.

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

17 October 2026Patsy67

Excellent thermal leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These leggings are lovely and warm. I soon feel the cold so they are ideal for me. I like the colour and have bought a couple of thermal tops also in brown to go with them.

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

16 October 2026Mary Brown

Great quality

Originally posted on marksandspencer.com (UK)

Fabulous and like a tee shirt so hard to believe it’s underwear!

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

14 October 2026Braberra

Good fit

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Should be cosy in the winter months, found them a little hard to get on. Would have liked the brown to be darker.

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

10 October 2026Frances72

Good quality leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Warm & snuggle leggings, just right for winter time

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

10 October 2026Nicbuch54

Great thermal leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Leggings purchased as undergarments for. December trip to Finland. They feel very warm, cosy and comfortable and fit true to size. Very pleased with my purchase.

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

09 October 2026Mary Meehan

Handy and stylsh

Yes, I recommend this

I have been buying these trousers for my mum for some time now and she never fails to tell me how comfortable they are and she is always delighted with the varied choice of colours.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

09 October 2026MummyB100

So soft, warm & comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

A staple in my winter wardrobe, warm and very comfortable, I have these leggings in several colours.

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

06 October 2026DRKG61

Toasty

Originally posted on marksandspencer.com (UK)

These leggings are really soft and warm. Comfortable and a great fit too.

Helpful?

03 October 2026miranda260

Great quality, soft and comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I ordered these online with my other thermals in the chocolate brown. It feels soft, warm and comfortable to wear. I normally wear a size 12 but it was out of stock so I ordered it in a 14. The waist was a bit big and the length was a bit long but I will be wearing it under trousers.

Reviewer Ratings

How do you feel about the size?

A bit large

Helpful?

Reviewer Ratings

How do you feel about the size?

A bit large

21 September 2026may50

Lovely and soft.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I haven't worn these leggings as it isn't cold enough yet but they feel very soft and substantial. I always wear leggings with my wellies when I'm walking my dog in the muddy fields and I'm sure they will keep me snug 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

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