Boys' Underwear at M&S

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.

Boys' Underwear

10pk Cotton Rich Trunks (5-16 Yrs)

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

5pk Cotton Rich Trunks

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

5pk Pure Cotton Vests (2-14 Yrs)

5pk Cotton Rich Trunks

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

5pk Cotton Rich Plain Trunks (5-16 Yrs)

5pc Cotton Rich Trunks (5-16 Yrs)

10pk Cotton With Stretch Trunks (5–16 Yrs)

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

5pk Cotton Rich Coloured Waistband Trunks (5-16 Yrs)

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

5pk Pure Cotton Vests (2-14 Yrs)

7pk Cotton Rich Bright Trunks (5-16 Yrs)

5pk Pure Cotton Vests (2-14 Yrs)

10pk Pure Cotton Briefs (2-14 Yrs)

5pk Cotton Rich Plain Trunks (5-16 Yrs)

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

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

5pk Cotton Rich Trunks (5-16 Yrs)

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

10pk Pure Cotton Briefs (2-14 Yrs)

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

5pk Cotton with Stretch Trunks

2pk Heatgen™ Thermal Tops (2-14 Yrs)

7pk Cotton Rich Stripe Waistband Trunks (5-16 Yrs)

3pk Cotton Rich Trunks

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

5pk Cotton Rich Football Trunks (5-12 Yrs)

5pk Cotton With Stretch Checkerboard Trunks (5–16 Yrs)

2pk Heatgen™ Thermal Vests (2-14 Yrs)

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

5pk Cotton Rich Trunks (8-16 Yrs)

10pk Pure Cotton Star Briefs (2-8 Yrs)

10pk Pure Cotton Briefs (2-14 Years)

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

2pk Heatgen™ Thermal Tops (2-14 Yrs)

3pk Cotton Rich Stranger Things™ Trunks (5-16 Yrs)

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

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

5pk Cotton with Stretch Trunks (8-16 Yrs)

5pk Cotton Rich Camo Trunks (5 - 16 Yrs)

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

5pk Cotton Rich Trunks (8-16 yrs)

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

5pk Pure Cotton Hot Wheels Briefs (2-8 Yrs)

3pk Cotton with Stretch Trunks (8-16 Yrs)