Speedo Global Fit Junior Boys 4yrs-16yrs Size Guide

This size guide covers Speedo Global Fit junior boys' swimwear in numeric sizes 22–34 (equivalent to ages 4–16 years). All measurements are body measurements taken from your child's body, not garment measurements. Always use the hip measurement as the primary guide for boys' swimwear. International size equivalents (D, F, I, Lat Am, Aus, USA, CAN, MEX) are included in the sizing table below.

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Body Measurement Points
Speedo junior boys' swimwear body measurement diagram
How to Measure

Take all measurements directly against your child's skin using a soft tape measure. All measurements are body measurements, not garment measurements.

  • A
    HipMeasure around the widest part of the hips, 10cm below the natural waist. This is the primary measurement for boys' swimwear.
  • B
    WaistMeasure around the waist 5cm below the natural waist at the narrowest point.

*Waist is measured 5cm below the natural waist. **Hips are measured 10cm below the natural waist around the widest point.

Sizing Table — Speedo Global Fit Junior Boys' Swimwear (Ages 4–16 / Sizes 22–34)
Sizing 4yrs / 22 6yrs / 24 8yrs / 26 10yrs / 28 12yrs / 30 14yrs / 32 16yrs / 34
International Size Equivalents
GB Age / Size 4yrs / 22 6yrs / 24 8yrs / 26 10yrs / 28 12yrs / 30 14yrs / 32 16yrs / 34
D (Germany) — Height 104cm 116cm 128cm 140cm 152cm 164cm 176cm
F (France) 4 ans 5–6 ans 7–8 ans 9–10 ans 11–12 ans 13–14 ans 15–16 ans
I (Italy) 4 anni 5–6 anni 7–8 anni 9–10 anni 11–12 anni 13–14 anni 15–16 anni
Lat Am Talla 22 Talla 24 Talla 26 Talla 28 Talla 30 Talla 32 Talla 34
Aus Boy 4 Boy 6 Boy 8 Boy 10 Boy 12 Boy 14 Boy 16
USA 4 6 8 10 12 14 16
CAN 4 6 8 10 12 14 16
MEX 4 6 8 10 12 14 16
Body Measurements (cm)
Hip** 55–59 60–64 65–69 70–75 76–82 83–89 90–94
Waist* 52–53 55–56 57–61 62–66 67–71 72–74 75–78

*Waist is measured 5cm below the natural waist at the narrowest point. **Hips are measured 10cm below the natural waist around the widest point. All measurements are body measurements, not garment measurements.

Fit Notes — Speedo Global Fit Junior Boys' Swimwear
  • Always use the hip measurement as the primary guide when selecting a Speedo junior boys' swimsuit size.
  • Age is shown as a guide only — children grow at different rates, so always measure and compare to the size table rather than selecting by age alone.
  • Speedo junior boys' swimwear is designed to fit closely and securely — trunks and jammers should sit flat against the body with no gaping at the waistband or leg.
  • Speedo swimwear is made from chlorine-resistant fabrics that ease slightly with wear — do not size up based on initial tightness.
  • The waistband should feel snug but comfortable — not digging in or sitting loosely. Most Speedo junior styles feature an internal drawcord for adjustability.
  • Rinse in cold fresh water immediately after every use. Do not tumble dry, iron, or dry-clean.
  • Unsure? Contact our team or call +44 1827 330600.
Frequently Asked Questions — Speedo Junior Boys' Swimwear

Measure your child's hips and waist against their skin with a soft tape measure. Use the hip measurement as the primary guide and compare to the sizing table above. Age is shown as a guide only — always use body measurements to confirm the right size, as children grow at different rates.

We recommend sizing to your child's current measurements rather than sizing up for growth. Swimwear that is too large will not stay in place during swimming and may cause discomfort. Speedo's chlorine-resistant fabrics feel firm when new and ease slightly with regular use — a well-fitted suit will still feel comfortable after a few sessions.

Use the hip measurement to decide. If the hip falls between two sizes, choose the larger size. Most Speedo junior styles include an internal drawcord at the waist, which allows some adjustment for a more comfortable fit. Speak to a member of staff at Allens if you are unsure.

Trunks are a shorter style sitting above the knee, similar in length to shorts. Jammers are a longer, close-fitting style that extends to the knee, often preferred by competitive swimmers for their hydrodynamic profile. Both are sized using the same hip and waist measurements. If your child is swimming competitively or training regularly, jammers are generally the preferred choice.

Speedo junior swimwear sizes do not directly correspond to standard clothing or school uniform sizes. Always use body measurements to select the correct size. The age equivalents shown in the table are a secondary guide only — a child who wears age 10 in school clothing may need a different size in Speedo swimwear depending on their measurements.

Yes. Speedo junior swimwear is designed for regular pool use and is made from chlorine-resistant fabric suited to frequent swimming lessons and training sessions. For competitive swimming, Speedo also offer junior racing suits — speak to a member of staff at Allens for guidance on the right product for your child's level.

Rinse in cold fresh water immediately after every use to remove chlorine, salt, and sunscreen. Hand wash gently with a mild detergent if needed. Do not machine wash, tumble dry, iron, or dry-clean. Store flat and dry, away from direct sunlight. Avoid sitting on rough pool surrounds in the swimwear as this can cause premature fabric wear.