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Cool Comfort™ Seamless Bum Boosting Shorts

Product code: T321563

About this style

These flattering shapewear shorts create a smooth silhouette while offering a subtle lift with removable bum-boosting pads. Made from lightweight fabric with our signature Cool Comfort™ technology, they're breathable for comfortable all-day wear. The seamless design with light control shaping eliminates visible knicker lines and smooths your figure, making them the perfect foundation beneath any outfit. M&S Collection: Easy-to-wear wardrobe staples that combine classic and contemporary styles.

M&S

Cool Comfort™ Seamless Bum Boosting Shorts

€19.50

Colour

Waist

Free standard delivery over €75

Reviews (192)

3.8

57% Recommended this product

Mentions
14 March 2026Cozza57

Bumtastic!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I now have a bum to be proud of after years of ill-health lost my original one.

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True to size

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25 February 2026Christine Mcnulty

Love these.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Love these padded knicks,so comfortable,fit perfectly,looks great with jeans & dresses,highly recommend.

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True to size

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25 February 2026All the names have gone

Not suitable

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

Very disappointed. Large pads which wasn't what I was looking for. Just needed to shape my own rear! Returned.

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True to size

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Reviewer Ratings

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True to size

14 February 2026Infrequent_Shopper

Unnatural Shape

Originally posted on marksandspencer.com (UK)

No, I don't recommend this

I find the enhancement creates an unnatural shape as it produces a localised mound on the cheek making it look as if a pair of socks have been put in your knickers.

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True to size

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08 February 2026to long

Impressed

Originally posted on marksandspencer.com (UK)

Liked the product , but tended to roll down from waist band

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07 February 2026Janettereviews

WOW ! what a difference these make

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I was on holiday and read about these in the newspaper - a reporter had lost a lot of weight (as have I) and had lost her bottom. There were photos of her with/without these shorts in the same pair of jeans, and I ordered them immediately as it make such a difference. I found them a little hard to get on the first time - but I have been used to wearing baggy stuff until now - however they were extremely comfortable after wearing all day. The most amazing thing was the comfort - since losing my (very big) bottom it's been uncomfortable sitting on a hard chair...... not any more! these provide the padding I need and my trousers look so much better. Definitely recommend these.

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True to size

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02 February 2026Ma1957

Comfortable and lightweight

Originally posted on marksandspencer.com (UK)

Comfy to wear and gives a great shape. I would prefer them to be pantie style and the padded inserts to be moulded so they sit under the natural crease of your bottom!

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True to size

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01 February 2026AriomThims

Very good quality…

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Excellent quality, what I expect and always get from M and S, thank you

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True to size

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26 January 2026MrsJones2011

Game changer

Originally posted on marksandspencer.com (UK)

This is a game changer that really works for me. Totally natural look which requires a bit of positioning to suit your body. Totally unnoticeable.

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True to size

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True to size

16 January 2026Helapas

Very good purchase

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I bought this shorts a week ago before long travelling. I struggle with numbness related to sciatica. So after the years no bottom. I'm very happy with my great purchase. They are very comfy, stay in 0lace not too big. Perfect for winter with tick trousers and jumpers. I wish they sale a summer version with smaller bottom pads. I recommend it.

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True to size

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02 January 2026her_

Great job M&S

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I purchased 2 thinking they wouldn't be sufficient but wow - added perfect shape to my otherwise flat bottom so jeans hung beautifully and more comfortable to sit with cushioned support - perfect!

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True to size

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True to size

30 December 2025shootingstar30

Fabulous, very sexy.

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These are great for a special occasion. They give a nice shape under fitted clothes. I’m a woman of a certain age and lost the shape in my rear. I would definitely recommend them. Nice and light to wear, not hot like Spanx.

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True to size

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True to size

28 December 2025Pink290672

Great quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Does exactly as it says and is comfortable to wear, only down side is that I think it will be too hot in the summer and that's when you will use it the most

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True to size

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24 December 2025Trude21

Needs tweaking

Originally posted on marksandspencer.com (UK)

I take a 10 in trousers. M fitted me lovely. S was on the tight side at the waist. BUT The inserts of the medium are way too big. They look enormous on my size 10 frame. The size of the inserts in S are much better, significantly smaller and suited my body size much better. Wish I could have chosen insert size. The inserts are separated quite a bit and look weird but as soon as trousers go on that is no longer an issue as it looks very natural.

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A bit small

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A bit small

23 December 2025Isobella23

The BEST

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Out of all that i have bought and now binned these are absolutely the best .Gives such a nice shape to your body.So happy i found these already bought 4.

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13 December 2025Llesley

Good padding

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These shirts are providing the necessary comfort for me to sit down for Pilates 🧘‍♀️. I’d recommend them. However loose 1 star ⭐ for the waist band rolling down.

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True to size

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12 December 2025Ditsy Blonde

Give a little extra oomph

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These "bum boosters" help give my relatively flat bum a nice boost. I cheated a bit and put some extra soft padding in the pockets. Really easy to put on and comfortable and give a little extra oomph.

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True to size

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True to size

08 December 2025

Move over Kim K

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

I laughed with surprise when I put these on. They really are incredibly convincing.

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True to size

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08 December 2025lalala26

Do the job

Originally posted on marksandspencer.com (UK)

Quite comfortable and do a fairly adequate job. Washed ok.

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07 December 2025lurcher1

Happy!

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

These bum boosters are so comfortable to wear - I forget I have them on. I struggle to hold up my trousers/jeans, having a very flat ‘derrière’ but these improve the fit and create a much better silhouette. My dresses hang better too. They also wash well. I can thoroughly recommend - I’m thinking of buying more!

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True to size

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