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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

£22

Colour

Customers say:

Fits true to size()
Waist

Matching items: Thermal Fleece Top and Thermal Top
Free standard delivery over £75, otherwise from £3.99

Reviews (1228)

4.7

78% Recommended this product

Mentions
24 October 2026Nic759
Verified Purchase

Leggins

Yes, I recommend this

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

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

23 October 2026Polgara60
Verified Purchase

Warm and stylish

Yes, I recommend this

These are the warmest fleece leggings ever and are super comfortable.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

22 October 2026Sue240252
Verified Purchase

Great leggings

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 did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

20 October 2026Jennifer 77
Verified Purchase

Leggings

Yes, I recommend this

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

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

17 October 2026Patsy67
Verified Purchase

Excellent thermal leggings

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 did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

16 October 2026Mary Brown
Verified Purchase

Great quality

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

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

14 October 2026Braberra
Verified Purchase

Good fit

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 did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

10 October 2026Frances72
Verified Purchase

Good quality leggings

Yes, I recommend this

Warm & snuggle leggings, just right for winter time

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

10 October 2026Nicbuch54
Verified Purchase

Great thermal leggings

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 did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

09 October 2026Mary Meehan
Verified Purchase

Handy and stylsh

Originally posted on marksandspencer.ie

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.

Helpful?

09 October 2026MummyB100
Verified Purchase

So soft, warm & comfortable

Yes, I recommend this

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

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

06 October 2026DRKG61
Verified Purchase

Toasty

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

Helpful?

03 October 2026miranda260
Verified Purchase

Great quality, soft and comfortable

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 did it fit?

A bit large

Helpful?

Reviewer Ratings

How did it fit?

A bit large

21 September 2026may50
Verified Purchase

Lovely and soft.

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 did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

19 September 2026MargaretAlison
Verified Purchase

Excellent Quality

Yes, I recommend this

I amazed how soft and warm the Leggings are. I wouldn't hesitate to recommend them to anyone.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

19 September 2026Blast off
Verified Purchase

So warm and cosy

Yes, I recommend this

Bought these last year and they were so warm and cosy that I invested in 2 more pairs for this year.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

11 September 2026Kazzz34
Verified Purchase

Brown leggings size 10

Yes, I recommend this

Purchased for Autumn and have only tried them on to see if they fit... a little baggy around thighs but I have lost a lot of weight due to illness. Will be wearing with a tunic in the colder months.

Reviewer Ratings

How did it fit?

A bit large

Helpful?

Reviewer Ratings

How did it fit?

A bit large

11 September 2026Lizzie127
Verified Purchase

Lovely and warm

Yes, I recommend this

For myself, purchased last winter, so warm and comfortable , I purchased early to make sure I got my size.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

11 September 2026Hay1ey82
Verified Purchase

Thermal Fleece Leggings

Yes, I recommend this

So thick and warm. Love these and I get a new pair each year. I am size 16 / 18 and got a size 20 as they are normally on the smaller side in terms of the sizing.

Reviewer Ratings

How did it fit?

A bit small

Helpful?

Reviewer Ratings

How did it fit?

A bit small

10 September 2026BVid
Verified Purchase

Good leggings.

Yes, I recommend this

Good quality. Kept me warm on a cold day! Very soft material. Shame they are so expensive

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

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