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Heatgen™ Medium Thermal Leggings

Product code: T329262P

About this style

These thermal leggings from M&S use Heatgen™ technology to bring a medium warmth rating, keeping the chill out on colder days. Added stretch in the fabric gives a comfortable, flexible fit that moves with the body throughout the day. They layer easily under trousers or dresses.

M&S

Heatgen™ Medium Thermal Leggings

€22

Colour

Waist

Free standard delivery over €75, otherwise €4.50

Reviews (7)

3.3

43% Recommended this product

22 October 2026LCHADD

Not for me and apparently others.

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Absolutey love the pattern of these leggings but they are not up to usual M&S standards, they are not high waisted like usual, not as soft or comfy. The pattern also discontorts quite noticeably. The sizing is another issue, i usually purchase a 12 and they fit perfect however these are a size M and don't feel even remotely like a usual m&s size 12, they feel smaller if anything. Really noticing M&S slacking on quality over the last few months.

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

20 October 2026Shoehorned

Pattern leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great to have a pattern instead of black leggings. Good for wearing with dresses and skirts. Would like some pattern in the thickest fleece. These sit lower on the waist than I like . More patterns please M&S

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

13 October 2026FrannyM

Perfect

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Product is well made & very warm. Great for wearing about the house under loose clothing keeping the chills out so delaying the need for heating on.

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 October 2026Riea

Not up to M&S usual standard

Originally posted on marksandspencer.com (UK)

I was hoping the legging would be sized as in previous years, I was in two mind’s whether to return them. Lucky I’m only 5ft and they just about reach my ankles. They are at least 3” shorter than usual and not as soft. Maybe M&S should start adding true measurements of their garments individually instead of your customers having to return items wasting our time and yours. The sizing re S.M.L etc seems arbitrary, please go back to the realism of our sizes. i.e 8.10.12.14 etc

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

11 October 2026shopuntilyoudrop

Not very thermal!

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

So disappointed, more like tight material than thermal leggings, love the leopard print though.

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 2026Loyal Marks customer

Disaster for me

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Live in M&S thermals autumn, winter & spring. Love them. Excited to see new animal print. Most of my m&s thermal leggings are size 14 (about 20 pairs) but have a couple of pairs size 16 too. All fab & a great fit. New sizing & lack of choice of sizes is a big issue for me. I knew M (12-14) would be too small for me especially as these only contain 6% elastane (plain colours 8% elastane) so went for L. Massive! Weird shape. Waist enormous but length from crotch to waist short. Leg length way too short. I am 5'6", length has always been ok. These are 3-4 inches (8-10) cms too short. Look ridiculous. Fabric is brushed inside but the outside isn't & feels like cheap polyester. Stretch the fabric & you get grainy lines distorting the pattern so the smaller size would have looked awful. Sadly, won't be able to buy any more thermal leggings from M&S with the current S, M, L sizing. Nothing worse than badly fitting leggings. May as well be selling "one size". Pleased to see turtle necks return in the max thermal tops but colour choice of black or claret is very poor (Have drawers full of black & claret doesn't suit my colouring) & then there's the sizing issue...back to the drawing board. Upset & disappointed.

Reviewer Ratings

How do you feel about the size?

Very large

Helpful?

Reviewer Ratings

How do you feel about the size?

Very large

08 October 2026stellaangelica

Warm animal print leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Lovely, comfortable; warm all essential for autumnal/winter wear. True to size.

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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