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M&S

Heatgen™ Maximum Thermal Fleece Leggings

£22

Colour

Customers say:

Fits true to size()
Waist

Matching items: Thermal Top and Thermal Fleece Top
Free standard delivery over £60

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.

Details & care

Item details

Model is wearing size: 12

Style

Added Stretch

Features

Heatgen™ technology

lightweight and supersoft, designed to keep you warm when the weather gets chilly

Composition

55% acrylic, 37% viscose and 8% elastane (exclusive of trimmings)

Care

Wash at 40°C

Do not bleach

Do not tumble dry

Do not iron

Do not dry clean

Delivery, collection & returns

Delivery

Standard

UK Standard Delivery is available for £3.99 or free on orders over £60 (excluding furniture).

Nominated Day

UK Next Day Delivery and UK Nominated Day Delivery (excluding Northern Ireland) are available for £5.99 (excluding furniture)

Collection

Collect from store

Store collection is free on all fashion, home and beauty orders.

Returns

UK returns

Free

Exclusions apply

Full delivery and collection informationOur returns policy

Reviews (1073)

4.7

78% Recommended this product

Mentions
28 January 2026flirtyatfifty
Verified Purchase

Keep you warm but not as robust as previous ones.

They hold the heat well but the external fleece is not as hardwearing as my old max heat ones.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

28 January 2026FL1
Verified Purchase

Simply the best

Yes, I recommend this

Best thermals I have ever owned and I am 75 years old!!!!

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

27 January 2026WickedWitchOfTheEast
Verified Purchase

Lovely

Yes, I recommend this

One of my new favourite things, super soft and a joy to wear.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

27 January 2026Beatrice24
Verified Purchase

Perfect for winter.

Yes, I recommend this

Like the matching top, these leggings will definitely keep you warm. They are very comfortable to wear, although I found them a little long in the leg (I'm 5' 1") - but I just tucked them in my socks.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

27 January 2026Comfort69
Verified Purchase

Warm but big

Yes, I recommend this

Although warm found too big for my 31 inch leg, size 12 with chunky thighs. Ordered size 14, changed to 12, probably could’ve worn size 10. Baggy around ones cause of this.

Reviewer Ratings

How did it fit?

Very large

Helpful?

Reviewer Ratings

How did it fit?

Very large

27 January 2026SBells
Verified Purchase

Keep warm

Yes, I recommend this

Great price had these last year great for the cold weather always feel warmer with these

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

27 January 2026ClaireMiao
Verified Purchase

Warm and soft!

Yes, I recommend this

I have been wearing M&S heatgen leggings for many years now, I live in these year round, they are the absolute the best.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

26 January 2026Gembobcirclepants
Verified Purchase

Really warm and comfortable

Yes, I recommend this

Long enough for 5ft8 girl. Warm and wash better than cheaper thermals I've bought. Very happy. Got them on now.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

26 January 2026Nyashboyboy
Verified Purchase

Nice and warm

Yes, I recommend this

Love these leggings,lovely and warm ,I purchased two pairs ,one navy the other brown ,as with a lot of marks and spencer clothing they were really different sizes the legs were about a 2” different in length and a bit more slack though they both had the same size label ! Apart from that great

Helpful?

26 January 2026MaryG123
Verified Purchase

Great Quality!

Yes, I recommend this

Great fit, super soft and warm material. Great quality would buy again. Highly recommend

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

26 January 2026Amana77
Verified Purchase

If you feel the cold buy these!

Yes, I recommend this

These leggings are great. Nice and thick quality. They are very comfortable to wear, and they don't go saggy at the knees, as others have done!!!! Have kept me toasty through some very cold weather! I am so pleased I bought them. Will be buying more in the future!

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

26 January 2026Lanky69
Verified Purchase

Great quality

Yes, I recommend this

Good quality thermal leggings. Keeps you warm and comfortable.

Reviewer Ratings

How did it fit?

A bit large

Helpful?

Reviewer Ratings

How did it fit?

A bit large

25 January 2026Caroline 2020
Verified Purchase

The very Best Therman Leggings. Great under skirts

Yes, I recommend this

Super cosy and I love the high waist. Great value.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

25 January 2026CarolCee
Verified Purchase

Helps keep you warm.

Yes, I recommend this

I bought this in brown for my Daughter as a present. She's a football Mum, and this as well as the top will keep her warm.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

25 January 2026TheWoolyWoodturner68
Verified Purchase

Really warm, no baggy knees

Yes, I recommend this

I found these leggings to be comfortable and warm. They fitted well. No bagging to the knees or bottom even if worn for several days in succession. They did not drag down either but stayed in place. Very good value for money. The only slight downside was the length, which was too long for me.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

24 January 2026Mfeitc
Verified Purchase

Great quality!

Yes, I recommend this

I highly recommend this thermal leggings. I love its softness and thickness and how comfortable and warm I feel when I wear it. I bought two sizes higher than I normally wear because I don't like tight clothes. It worked very well with me.

Reviewer Ratings

How did it fit?

A bit large

Helpful?

Reviewer Ratings

How did it fit?

A bit large

24 January 2026Sharon 11420
Verified Purchase

A staple of my winter wardrobe.

Yes, I recommend this

Fits true to size. Warm and comfortable and good value for money.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

24 January 2026Bunnytiptoes
Verified Purchase

Bunnykins

Yes, I recommend this

These leggings are amazing, they keep you so warm, quality excellent, and the price, so comfortable good fit. I would always choose your leggings the best.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

23 January 2026derbyshire dog walker
Verified Purchase

these are fab!

Yes, I recommend this

really comfy. fit well and snug, lovely and warm!!

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

23 January 2026oldkenlady
Verified Purchase

Great thermal for very cold weather

Yes, I recommend this

Good fit in both body length and leg . I’m 5’5”. Nice navy colour and thick so very warm.

Reviewer Ratings

How did it fit?

True to size

Helpful?

Reviewer Ratings

How did it fit?

True to size

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