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Heatgen™ Thermal Shaping Leggings

Product code: T327204

About this style

Feel supported and comfortable during colder months with these Heatgen™ thermal shaping leggings. The sculpting design gently complements your natural curves while the innovative Heatgen™ technology traps heat effectively without adding bulk. Made from soft, brushed fabric with a cosy feel against the skin, these M&S Collection leggings offer warmth and comfort with a flattering silhouette that moves with you throughout the day. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

M&S

Heatgen™ Thermal Shaping Leggings

€23

Colour

Waist

Matching items: Long Sleeve Body
Free standard delivery over €75

Reviews (28)

4.4

79% Recommended this product

26 March 2026OlZel

Amazing Leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Absolutely love them. They’re my comfort clothes for home. Ordered 3 pair already. I just live in them. Very comfortable stretchy good for active sport, yoga 🧘 too

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 2026Sue2806

Great quality and fit

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very comfortable under jeans and trousers. Kept me warm in very cold temperatures in Iceland! I bought size 12 although I’m usually a 10 as other reviews suggested going up a size - good advice!

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 March 2026GeeneeC

Great leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Good support very cosy leggings would highly recommend

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

01 March 2026This doesnt work

Not as expected

Originally posted on marksandspencer.com (UK)

These were not as I expected. I really wanted the heatgen leggings but out of stock. These are not the same waistband type. So returned them.

Helpful?

26 February 2026Orangekitty

Good quality and quite shaping

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Really good, thick and stomach flattening. Can wear as outerwear or under jeans. Bought a second pair

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

23 February 2026koh256

Brilliant leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I have leg circulation issues and these leggings are fantastic. They're supportive, not too thick, not furry inside and they help my legs to feel normal. Plus they look like normal leggings! Very pleased.

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 February 2026Hay66

Excellent value

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Excellent value true to size would recommend this item

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

15 February 2026Mocksy

Excellent thermal shape-wear leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Perfect fit very comfortable. Kept me very warm. Impressed with shaping also.

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 February 2026Leamington37

Don’t fit

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Sizing all wrong. Couldn’t get them on. I only weigh 8st 10lbs!

Helpful?

07 February 2026Yhb123

Lovely soft material

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Perfect as an underneath layer as not too thick. Very shaping but order a size up as comes up small. I wish there were in between sizes eg. 12-14

Reviewer Ratings

How do you feel about the size?

Small

Helpful?

Reviewer Ratings

How do you feel about the size?

Small

06 February 2026Aj nl

Really nice

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

When i opened these i was slightly dubious as they seemed rather flinsy. I was wrong. Really comfy, not at all see through and very 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

25 January 2026Beebird12

Cosy leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Not bought for a special occasion however wanted something snug and they certainly fit the bil

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

24 January 2026happycustomer22

Warm and toasty

Yes, I recommend this

Excellent warmth and very cosy. Very comfortable under trousers or jeans.

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

Helpful?

Reviewer Ratings

Quality

Excellent

Value for Money

Excellent

24 January 2026LottieT84

Love them

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Really soft and comfortable. Havent worn the. Iut yet but looking forwards to it

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 January 2026LeoSuki

Perfect for under jeans

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great leggins for under jeans as they are not bulky at all. Keep you extra warm on those chilly days

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

18 January 2026Iron23

Good quality

Originally posted on marksandspencer.com (UK)

My wife say it is warm enough for moderately 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

13 December 2025Sonia27

Great fit, lovely and cosy like a second skin

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Great fit, lovely and cosy like a second skin. Very easy to put on, fine enough to wear under jeans or leggings when outside in 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

12 December 2025Ja35

Cosy and warm leggings

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Good quality True to size Comfy and lovely soft material Good value for 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

24 November 2025Leamore

Really recommend these.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Wear these with a thermal top for real warmth. I always size up because I like the extra length to tuck into socks. Really recommend.

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

18 November 2025Olue

Loving this

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I’m very pleased with these leggings. I like that they don’t show under fitted trousers, keep me warm AND smoothen my shape. I really like the wide waistband and the fact that it doesn’t dig into me. I bought these during an offer and really feel it was money well spent. Lovely product M&S, welldone.

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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