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Boys' Underwear at M&S

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on selected boys' clothing
  • Product Type with 5 options
  • Kids Sizes with 22 options
  • Multipack with 6 options

There are 85 Items found

2pk Heatgen™ Thermal Leggings (2-14 Yrs)
£12 - £13
M&S Collection

2pk Heatgen™ Thermal Leggings (2-14 Yrs)

2pk Heatgen™ Thermal Tops (2-14 Yrs)
£12 - £13
M&S Collection

2pk Heatgen™ Thermal Tops (2-14 Yrs)

5pk Cotton with Stretch Gaming Trunks (5-16 Yrs)
£11.50 - £12.50
M&S Collection

5pk Cotton with Stretch Gaming Trunks (5-16 Yrs)

5pk Cotton with Stretch Camo Trunks (5-16 Yrs)
£11.50 - £12.50
M&S Collection

5pk Cotton with Stretch Camo Trunks (5-16 Yrs)

2pk Heatgen™ Thermal Tops (2-14 Yrs)
£12 - £13
M&S Collection

2pk Heatgen™ Thermal Tops (2-14 Yrs)

2pk Heatgen™ Thermal Tops (2-14 Yrs)
£12 - £13
M&S Collection

2pk Heatgen™ Thermal Tops (2-14 Yrs)

5pk Cotton with Stretch Trunks (5-16 Yrs)
£9.50
M&S Collection

5pk Cotton with Stretch Trunks (5-16 Yrs)

5pk Pure Cotton Vests (2-14 Yrs)
£9.50
M&S Collection

5pk Pure Cotton Vests (2-14 Yrs)

5pk Cotton with Stretch Coloured Waistband Trunks (5-16 Yrs)
£9.50
M&S Collection

5pk Cotton with Stretch Coloured Waistband Trunks (5-16 Yrs)

2pk Heatgen™ Thermal Tops (2-14 Yrs)
£11 - £12
M&S Collection

2pk Heatgen™ Thermal Tops (2-14 Yrs)

4pk Pure Cotton Short Sleeve Vests (2-14 Yrs)
£9.50
M&S Collection

4pk Pure Cotton Short Sleeve Vests (2-14 Yrs)

2pk Heatgen™ Thermal Vests (2-14 Yrs)
£10 - £11
M&S Collection

2pk Heatgen™ Thermal Vests (2-14 Yrs)

5pk Cotton with Stretch Football Trunks (5-12 Yrs)
£11.50 - £12.50
M&S Collection

5pk Cotton with Stretch Football Trunks (5-12 Yrs)

5pc Cotton with Stretch Trunks (5-16 Yrs)
£9.50
M&S Collection

5pc Cotton with Stretch Trunks (5-16 Yrs)

2pk Heatgen™ Thermal Leggings (2-14 Yrs)
£12 - £13
M&S Collection

2pk Heatgen™ Thermal Leggings (2-14 Yrs)

5pk Pure Cotton Vests (2-14 Yrs)
£9.50
M&S Collection

5pk Pure Cotton Vests (2-14 Yrs)

Keep them toasty

Read & shop
Content card KW Thermals 17/102024 2023
5pk Cotton with Stretch Plain Trunks (5-16 Yrs)
£9.50
M&S Collection

5pk Cotton with Stretch Plain Trunks (5-16 Yrs)

3pk Pure Cotton Long Sleeve Vests (2-14 Yrs)
£9.50
M&S Collection

3pk Pure Cotton Long Sleeve Vests (2-14 Yrs)

Knitted Jumper (8-16 Yrs)
New
£25
JACK & JONES JUNIOR

Knitted Jumper (8-16 Yrs)

Knitted Jumper (8-16 Yrs)
New
£25
JACK & JONES JUNIOR

Knitted Jumper (8-16 Yrs)

5pk Cotton with Stretch Trunks (5-16 Yrs)
£11.50 - £12.50
M&S Collection

5pk Cotton with Stretch Trunks (5-16 Yrs)

5pk Cotton with Stretch Trunks (5-16 Years)
£9.50
M&S Collection

5pk Cotton with Stretch Trunks (5-16 Years)

5pk Pure Cotton Spider-Man™ Briefs (2-8 Yrs)
£9.50 - £10.50
M&S Collection

5pk Pure Cotton Spider-Man™ Briefs (2-8 Yrs)

5pk Cotton with Stretch Spencer Bear™ Trunks (5-14 Yrs)
New
£11.50 - £12.50
Spencer Bear™

5pk Cotton with Stretch Spencer Bear™ Trunks (5-14 Yrs)

5pk Cotton with Stretch Striped Trunks (5-16 Yrs)
£11.50 - £12.50
M&S Collection

5pk Cotton with Stretch Striped Trunks (5-16 Yrs)

7pk Pure Cotton Transport Briefs (2-8 Yrs)
New
£9.50
M&S Collection

7pk Pure Cotton Transport Briefs (2-8 Yrs)

7pk Pure Cotton Football Briefs (2-8 Yrs)
New
£9.50
M&S Collection

7pk Pure Cotton Football Briefs (2-8 Yrs)

10pk Pure Cotton Striped Briefs (2-14 Yrs)
£9.50
M&S Collection

10pk Pure Cotton Striped Briefs (2-14 Yrs)

2pk Heatgen™ Thermal Leggings (2-14 Yrs)
£12 - £13
M&S Collection

2pk Heatgen™ Thermal Leggings (2-14 Yrs)

10pk Pure Cotton Briefs (2-14 Yrs)
£9.50
M&S Collection

10pk Pure Cotton Briefs (2-14 Yrs)

7pk Pure Cotton Dinosaur & Striped Briefs (2-8 Yrs)
£9.50
M&S Collection

7pk Pure Cotton Dinosaur & Striped Briefs (2-8 Yrs)

3pk Cotton with Stretch Sonic™ Trunks (5-16 Yrs)
£10.50 - £11.50
M&S Collection

3pk Cotton with Stretch Sonic™ Trunks (5-16 Yrs)

7pk Pure Cotton Days of the Week Briefs (2-8 Yrs)
£9.50
M&S Collection

7pk Pure Cotton Days of the Week Briefs (2-8 Yrs)

2pk Heatgen™ Thermal Tops (2-14 Yrs)
£11 - £12
M&S Collection

2pk Heatgen™ Thermal Tops (2-14 Yrs)

2pk Cotton Blend Thermal Waffle Tops (2-14 Yrs)
£13 - £14
M&S Collection

2pk Cotton Blend Thermal Waffle Tops (2-14 Yrs)

10pk Pure Cotton Briefs (2-14 Yrs)
£9.50
M&S Collection

10pk Pure Cotton Briefs (2-14 Yrs)

2pk Cotton Blend Thermal Waffle Tops (2-14 Yrs)
£13 - £14
M&S Collection

2pk Cotton Blend Thermal Waffle Tops (2-14 Yrs)

2pk Cotton Blend Thermal Waffle Tops (2-14 Yrs)
£13 - £14
M&S Collection

2pk Cotton Blend Thermal Waffle Tops (2-14 Yrs)

2pk Cotton Blend Thermal Waffle Bottoms (2-14 Yrs)
£13 - £14
M&S Collection

2pk Cotton Blend Thermal Waffle Bottoms (2-14 Yrs)

2pk Cotton Blend Thermal Waffle Bottoms (2-14 Yrs)
£13 - £14
M&S Collection

2pk Cotton Blend Thermal Waffle Bottoms (2-14 Yrs)

2pk Cotton Blend Thermal Waffle Bottoms (2-14 Yrs)
£13 - £14
M&S Collection

2pk Cotton Blend Thermal Waffle Bottoms (2-14 Yrs)

2pk Heatgen™ Thermal Tops (2-14 Yrs)
£11 - £12
M&S Collection

2pk Heatgen™ Thermal Tops (2-14 Yrs)

7pk Pure Cotton Animal Briefs (2-8 Years)
£9.50
M&S Collection

7pk Pure Cotton Animal Briefs (2-8 Years)

2pk Heatgen™ Thermal Vests (2-14 Yrs)
£10 - £11
M&S Collection

2pk Heatgen™ Thermal Vests (2-14 Yrs)

5pk Pure Cotton Paddington™ Briefs (2-8 Yrs)
£9.50 - £10.50
M&S Collection

5pk Pure Cotton Paddington™ Briefs (2-8 Yrs)

2pk Cotton Blend Thermal Waffle Bottoms (2-14 Yrs)
£13 - £14
M&S Collection

2pk Cotton Blend Thermal Waffle Bottoms (2-14 Yrs)

2pk Heatgen™ Thermal Vests (2-14 Yrs)
£10 - £11
M&S Collection

2pk Heatgen™ Thermal Vests (2-14 Yrs)

5pk Cotton with Stretch Avengers Briefs (2-8 Yrs)
£9.50 - £10.50
M&S Collection

5pk Cotton with Stretch Avengers Briefs (2-8 Yrs)

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To keep growing youngsters stocked up with the basics, browse the boys’ underwear in our kids’ clothes collection. We have all the essential styles in sizes for toddlers up to teenagers. Must-haves including pants come in convenient multi-packs containing up to 10 pieces, so you don’t have to worry about running out mid-week. Rash vests are on hand to protect active children from the sun and keep them warm in the water.

Because underwear has to be practical, comfortable and hardwearing, we’ve crafted ours from pure cotton or cotton-rich fabrics with a hint of stretch. This makes everything breathable and naturally cooling, while allowing for easy movement. Close-fitting briefs with our StayNew™ technology can be trusted to hold their colour and retain their texture, wash after wash. Look out for vibrant prints of favourite characters, from Spider-Man™ to Marvel™ heroes. 

Our boys’ trunks are cut to a modern shape with a little more length through the legs, so they sit smoothly under trousers and shorts. Explore options with deep colour-contrast waistbands that boost comfort and resist rolling. For everyday wear, we have packs of black pairs and white styles that coordinate neatly with lightweight vests and tees. 

When there’s a nip in the air and it’s time to layer up, discover our collection of kids’ thermals. Insulating Heatgen™ tops with long sleeves efficiently trap in warmth – their brushed finishes and ribbed details make for a super-cosy feel against the skin. T-shirts with short sleeves are non-bulky, slipping easily under shirts. For camping trips and cold-weather adventures, pick out some slim-fitting long johns to lock out chills.