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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

Sale items

Waist

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

Reviews (1172)

4.7

78% Recommended this product

Mentions
11 March 2026Dip2253

Warm and great value.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Well made and comfy to wear. Very warm and keep out the cold.

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 March 2026DianeCath58

Super warm and comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These are by far the best thermal leggings I have ever purchased They are so cosy 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

11 March 2026Jane968

Wonderful at -4

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought for a trip to Norway. Was very comfortable against the skin and lovely 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

07 March 2026sukisue2

Cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Soft cosy leggings slightly longer in the leg which helps keeps socks in place, I’ve several pairs now in different colours and plan to get more. For cat lovers out there mine love curling up on my lap when I’ve got them on

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

07 March 2026thesuburbanmummy

Warm but very polyester

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Ok. Nice and warm. Smell of chemicals, bobble quickly.

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 March 2026Polly500

Nice and warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

A shame that there is no choice in length. At 5ft 6 I find them a bit long but manage with leaving them bunched up at the ankles. Otherwise they are nice and warm and comfy. I haven’t washed them yet so can’t comment.

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

06 March 202642Anon

Would recommend

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These are nice quality, warm and wash well. This is my third pair. The only negative is that the ankle is quite wide, which is unnecessary since they stretch anyway.

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 March 2026Nobbers

Warm & long legged

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very nice leggings. I bought these in black & brown. I didn’t give them full stars as they are very long in the legs and petite would have been better when you’re only 5ft 1. There wasn’t an option available. Overall they are warm and good 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

06 March 2026Dippers44

Good quality a little long

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely and warm but quite long. Thankfully they contain a good amount of elastane so they can be pulled up without going saggy. I’m 5’8” and found them a bit too long but kept them as all the others I tried were too short!

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

05 March 2026L_S_A_1

Super warm!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great leggings to keep you warm in the winter months.

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

05 March 2026Georgie01

Warm leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Warm and cosy. A little long for me at 5'3" but I can alter or turn the bottom of the legs up.

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

05 March 20263retrievers

Basic winter necessities for daughter

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought for daughter who suffers from Raynauds A staple of her winter clothing as warm reliable and 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

04 March 2026Advil

Warm and comfy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

This is a great product. Our boiler broke down and it took a while to get it replaced so the house was cold. These kept me so warm I bought a second pair. Have recommended them to my daughter!

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 March 2026SuzySooz

Warm leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Purchased these in brown, I've struggled to find brown leggings anywhere. I've not worn these yet so marked only 4☆. I have several of the M&S Thermal tops & love them so hope these will be just as warm. I'm a 12/14 & purchased these in 14. Like other reviews state the leggings are a bit long. I'm a 30 leg, but will turn these up when wearing boots or role them when wearing trainers. They may shrink a bit when washed, the tops do, at 40°

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 March 2026Haselnuss

Cosy, but not bulky

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought these because they were on offer and such a lovely colour. They didn't disappoint when I got them home and tried them on. So cosy without being bulky.

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 March 2026classydresser45

Warm and cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great for dog walking, especially under waterproof trousers and wellies. Very long though. May have to turn up even though 5ft 6 ins. Good qujality.

Reviewer Ratings

How do you feel about the size?

Very large

Helpful?

Reviewer Ratings

How do you feel about the size?

Very large

03 March 2026Lily Anne

Great Quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These leggings are so soft and cosy. They are really good quality and I am really happy with ny 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

28 February 2026LoveMinis

Very comfortable warm option to beat the chill!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These Max Thermal leggings have been great this very chilly winter - indeed I have purchased several pairs that I have used a lot for gardening and housework when the softness and stretch in the fabric is also very pleasant versus my usual jeans. Moreover, given some low temp days, I even used the Heatgen for shopping and casual meals out

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

28 February 2026Loubelou123

Great leggings - but...

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

They are fantastically warm and wash really well. However why are they so long!??? I'm 5.5 and they gather in folds at my ankles. These should come in the same options as your standard leggings. The other issue is the lable doesn’t identify whether its Max or Med Thermal I've got both but i have to feel and gague the thickness depending on the weather. Simple. Please change the length options as it makes them look like i borrowed them from a very tall lady!!

Helpful?

27 February 2026houstongirl

Nice leggings.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I bought these for my daughter who found them warm and 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

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