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Boys' size guides

Boys' Swimwear+

Junior boys swimwear excludes watershorts, racing and ages 0-4.

Inches

CM

Approx. Age Height Chest Waist Hips Speedo Size
4 - 5 41" 21.5" 21" 23.5" 22
5 - 6 46" 23.5" 23" 25.5" 24
7 - 8 50" 25.5" 24" 27.5" 26
9 - 10 55" 28" 26" 29.5" 28
11 - 12 60" 30.5" 28" 32" 30
13 - 14 64.5" 33" 30" 34.5" 32
15 - 16 69" 36" 32" 37" 34
4 - 5 104cm 54.5cm 53.5cm 60cm 22
5 - 6 116cm 60cm 58cm 65cm 24
7 - 8 128cm 65.5cm 61.5cm 70cm 26
9 - 10 140cm 71cm 66cm 75cm 28
11 - 12 152cm 78cm 71cm 81.5cm 30
13 - 14 164cm 84cm 76cm 88cm 32
15 - 16 176cm 91cm 81cm 94.5cm 34

Speedo swimsuits are designed to have a close fit to your body to help you have the best swim. If you would like a looser fit you can go up a size.

How to measure your child

  • Height

    Remove their shoes and measure their height against a wall.

  • Chest

    Measure under the arms at the fullest part of the chest.

  • Waist

    Measure around the smallest part of their waist.

  • Hips

    Measure around the widest part of the hips and bum.

Boys Size Guides 2 3 4 1
Junior Boys Swim Shorts+

Inches

CM

Approx. Age Height Waist Speedo Size
4 - 5 yrs 41" 22" XS
6 - 7 yrs 46" 24" S
8 - 9 yrs 50.5" 26" M
10 - 11 yrs 55" 28" L
12 - 13 yrs 60" 30" XL
13 - 14 yrs 64.5" 32" XXL
15+ yrs 69" 34" XXXL
4 - 5 yrs 104cm 55cm XS
6 - 7 yrs 116cm 60cm S
8 - 9 yrs 128cm 65cm M
10 - 11 yrs 140cm 70cm L
12 - 13 yrs 152cm 75cm XL
13 - 14 yrs 164cm 80cm XXL
15+ yrs 176cm 85cm XXXL

How to measure your child

  • Height

    Remove their shoes and measure their height against a wall.

  • Waist

    Measure around the smallest part of their waist.

Boys Size Guides 1 2
Boys' 6 months - 6 years Swimwear+

Inches

CM

Height Waist Speedo Size
29 - 31" 19.5" 6 - 9 MTHS
31 - 33" 20.5" 9 - 12 MTHS
36" 21" 2 YRS
39" 21.5" 3 YRS
43" 22" 4 YRS
45" 22.5" 5 YRS
47" 23" 6 YRS
74 - 80cm 50cm 6 - 9 MTHS
80 - 84cm 52cm 9 - 12 MTHS
92cm 54cm 2 YRS
100cm 55cm 3 YRS
110cm 56cm 4 YRS
115cm 57cm 5 YRS
120cm 58cm 6 YRS

The fit of your suit is down to your personal preference and your race event. See the diagram below for more guidance on which size is right for you.

How to measure your child

  • Height

    Remove their shoes and measure their height against a wall.

  • Waist

    Measure around the smallest part of their waist.

Boys Size Guides 1 2
Boy's Float Vest+
Chest Mass Speedo Size
51cm 0-15kg 1-2 YRS
56cm 15-20kg 2-4 YRS
61cm 20-30kg 4-6 YRS
Boy's Float Suit+
Chest Mass Speedo Size
55cm 15-18kg 2-3 YRS
57cm 18-22kg 3-4 YRS
59cm 22-26kg 4-5 YRS
61cm 26-30kg 5-6 YRS
Boy's Swim (Aqua) Nappy+
Height Mass Speedo Size
62cm 6kg 0-3 Mths
68cm 8kg 3-6 Mths
74cm 9.5kg 6-9 Mths
80cm 11kg 9-12 Mths
86cm 12kg 12-18 Mths
92cm 13kg 18-24 Mths
Boys' Fastskin LZR X Racing Suit+

Our Junior LZR Racer X is the most compressive suit we have in our Fastskin Junior range. The hip measurement is the key part. Choose your size using the hip measurement first, and use the lower waist measurement as an extra guide.

Inches

CM

Waist Hips Speedo Size
23-24.5" 27.5-28.5" 24
25-26" 29-30" 26
26.5-27.5" 30.5-32" 28
28-29" 32-33.5" 30
29.5-30.5" 34-35" 32
31-32.5" 35.5-36.5" 34
59-62cm 70-73cm 24
63-66cm 74-77cm 26
67-70cm 78-81cm 28
71-74cm 82-85cm 30
75-78cm 86-89cm 32
79-83cm 90-93cm 34

How to measure your child

  • Waist

    Measure around the smallest part of their waist.

  • Hips

    Measure around the widest point of the hips and bum.

Boys Size Guides 2 1
Tips:
  • Your body changes as you train, so we recommend measuring yourself again every time you buy a new suit
  • Due to compression, it can take up to 20mins to put on your suit
Boys' Fastskin Endurance+ Racing Suit+

The lower waist measurement on the Fastskin Endurance+ is the key part. Choose your size using the lower waist measurement first, and use the height and hip measurements as an extra guide.

Inches

CM

Approx. Age Waist Hips Height Speedo Size
4 yrs 21" 23.5" 41" 22
6 yrs 23" 25.5" 46" 24
8 yrs 24" 27.5" 50" 26
10 yrs 26" 29.5" 55" 28
12 yrs 28" 32" 60" 30
14 yrs 30" 34.5" 64.5" 32
16 yrs 32" 37" 69" 34
4 yrs 53.5cm 60cm 104cm 22
6 yrs 58cm 65cm 116cm 24
8 yrs 61.5cm 70cm 128cm 26
10 yrs 66cm 75cm 140cm 28
12 yrs 71cm 81.5cm 152cm 30
14 yrs 76cm 88cm 164cm 32
16 yrs 81cm 94.5cm 176cm 34

How to measure your child

  • Waist

    Measure around the smallest part of their waist.

  • Hips

    Measure around the widest point of the hips and bum.

  • Height

    Remove their shoes and measure their height against a wall.

Boys Size Guides 1 2 3