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

Thermal Cotton Blend Spencer Bear Set (2-12 Yrs)

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

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

2pk Thermal Leggings (2-14 Yrs)

2pk Thermal Leggings (2-14 Yrs)

2pk Thermal Leggings (2-14 Yrs)

10pk Pure Cotton Stripes & Solids Briefs (2-14 Yrs)

2pk Heatgen™ Thermal Tops (2-14 Yrs)

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

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

2pk Heatgen™ Thermal Tops (2-14 Yrs)

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

2pk Heatgen™ Thermal Tops (2-14 Yrs)

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

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

5pk Spider-Man™ Vests (2-8 Yrs)

10pk Pure Cotton Briefs (2-14 Years)

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

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

2pk Heatgen™ Thermal Tops (2-14 Yrs)

2pk Heatgen™ Thermal Tops (2-14 Yrs)

Avengers™ Thermal Set (2-12 Yrs)

5pk Pure Cotton Plain Vests (2-14 Yrs)

10pk Pure Cotton Core Brights Briefs (2-14 Yrs)

5pc Cotton Rich Trunks (5-16 Yrs)

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

10pk Cotton with Stretch Trunks (5-16 Yrs)

5pk Pure Cotton Plain Vests (2-14 Yrs)

3pk Cotton Rich Spider-Man™ Trunks(3-10 Yrs)

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

2pk Heatgen™ Thermal Tops (2-14 Yrs)

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

10pk Cotton with Stretch Trunks (5-16 Yrs)

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

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

10pk Pure Cotton Briefs (2-14 Yrs)

5pk Pure Cotton Vests (2-14 Yrs)

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

Lilo & Stitch™ Thermal Set (2-12 Yrs)

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

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

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

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

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

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

10pk Pure Cotton Briefs (2-14 Yrs)

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

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