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5 Pack 360 Flex Horizontal Fly Trunks

Product code: T145347A

About this style

Introducing our five pack Horizontal Fly Trunks. Our exciting new Horizontal fly is positioned across the front of the underwear, carefully engineered to provide easy access for convenience. Made in a regular fit, from our 360 Flex modal rich fabric that provides four-way stretch, so it moves with you for greater comfort. Lycra® Xtra Life™ helps your underwear keep their shape over time, whilst our StayNew™ finish maintains the colour and texture, wash after wash. Autograph: premium investment pieces featuring contemporary cuts and refined finishing touches.

Autograph

5 Pack 360 Flex Horizontal Fly Trunks

€49

Colour

Size

Also available in: Trunks
Free standard delivery over €75

Reviews (9)

4.6

89% Recommended this product

Mentions
04 March 2026R PATT

Mens black smooth underpants

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

My husband loved these ,he said they are very comfortable and true to size

Helpful?

08 February 2026Pete ash

Horizontal fly trunks

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

OMG why have these not been thought of before much easier & practical than ordinary fly I hope M&S do more colours & styles & they are not a one-off & M&S make more amazing maybe just a bit more pouch room would be good

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

28 January 2026L Burgess

Horizontal fly boxers

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

My husband loves these he says they are the best boxers he has had

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

21 January 2026RachieJH

Great quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Bought for my son instead of the requested expensive branded set. He liked them so much he asked for another set. The fabric feels good quality and the flexibility is a plus for his climbing hobby.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

29 December 2025Tigbits10

Desperate Despatching

Originally posted on marksandspencer.com (UK)

Ordered 5 pack 360 Flex horizontal Fly Trunks and got 5 pack multi-coloured vertical fly trunks rolled up and shoved in the bag along with the bashed and flattened packaging for the correct item. No good for gifting as intended and no online option to register my dissatisfaction with M&S. Felt like someone else's return which had been scooped up off the warehouse floor. No confidence in returning and re-ordering.

Helpful?

13 December 2025pricebeater

Brief encounter

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Very comfortable horizontal fly great idea,hope product not to be a pne of range as m&s so often would like all white option.will buy again.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

12 December 2025Ajd357

Great Quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Fantastic boxers. Very comfortable. A staple you couldn’t be without.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

10 December 2025Andynewpants

Great invention

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

Comfortable and the horizontal fly is a game changer.

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

01 December 2025pooracademic

Great quality

Originally posted on marksandspencer.com (UK)

Yes, I recommend this

It’s soft and flex. I washed once and they are in good shape as well. I’ll probably buy again

Reviewer Ratings

Comfort

Excellent

Helpful?

Reviewer Ratings

Comfort

Excellent

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