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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

Waist

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

Reviews (1200)

4.7

78% Recommended this product

Mentions
19 April 2026Emma3878

Warm, soft and comfortable

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Gorgeous legging, so soft and warm, runs big to size so recommend a size down

Reviewer Ratings

How do you feel about the size?

Large

Helpful?

Reviewer Ratings

How do you feel about the size?

Large

14 April 2026Auntie81

Very warm.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Really warm and comfy.Great price. Love them. Well worth the money.

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 April 2026Charlotte JSB

Soft and comfy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely soft leggins. Lightweight but warm and cosy.

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 April 2026Charlotte 14

Love them

Originally posted on marksandspencer.com (UK)

I bought these in the sale . Brilliant lovely and warm wish l had bought them years ago . Bought more can you do extra short .recommend them

Helpful?

04 April 2026Caroles2

Heathen thermal leggins

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These are really warm and comfortable. Love wearing these.

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 April 2026LC 2

Just a little long.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Good quality for the price. Will hopefully be warm as I have bought them for a winter holiday. I’m 5ft 4ins & whilst they are a little long on me I have kept them,choice of length would be good. I think I will buy another pair in brown.

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

02 April 2026Topaz62

Not great

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

These are lovely & soft but unfortunately just after a couple of washes they bobble.

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 March 2026Jenyo

Super warmth

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Best I have found to keep cold and damp at bay, aching joints no longer ache

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

30 March 2026pezza999

Toasty Thermals

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great leggings to match thermal top. Very warm and cosy 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

29 March 2026Justu

Excellent

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These leggins are great, I wear mine just around the house & yes they are a bit long as I’m only 5ft3 but they still look ok, tgey wash & it oh great but I don’t tumble dry them.

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

29 March 2026Saraik

Nice and warm

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Perfect base layer for a recent ski trip, didn’t feel cold at all and fitted perfectly

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 March 2026Jacqmm

Good length very soft

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Good longer length compared to other leggings this is why I kept them. I’m 5ft 6 and others shrink or pull up to show ankle. Also soft 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

25 March 2026MrsHutchy

Comfortable and warming

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These are super soft & comfortable to wear under my walking trousers. Unfortunately they left a layer of fluff on the inside of my trousers! They’ve washed well (I haven’t checked the washing machine filter!) & haven’t shrunk.

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 March 2026Mydormouse

Lovely!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely soft fabric, very comfortable and very warm. Well worth the money.

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 March 2026Holly1506

Very warm!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought these to take to Iceland, they were great. Kept me very warm & toasty.

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 March 2026MizzLizz

My go-to

Originally posted on marksandspencer.com (UK)

These are my go-to leggings, so cosy and warm. I wear them every day, and have them in several sizes: IYKYK.

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

19 March 2026PESKYSYL

Cozy & comfortable

Yes, I recommend this

Purchased for trip to Iceland. So soft & comfortable.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

18 March 2026JennH

Warm and cosy

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Incredibly warm and cosy, and thick enough to be flattering

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 March 2026LagunaBlonde

Delighted with them

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

This is my 2nd pair so comfy and cosy in cold weather

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 March 2026GwendolineS

Great Quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

brilliant, soft, warm,comfortable washes well. I am 5ft 4 no need to use any stretch and the stretch would take it to someone much taller . Recommended

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

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