Arena Girls Size Guide

This size guide covers Arena Girls Swimwear, sized by age range and body measurements. Arena girls' swimsuits are designed for young swimmers from ages 6–7 through to 14–15, offering a secure, comfortable fit for both training and recreational swimming.

Arena sizes girls' swimwear by height, chest, waist, and hip circumference. For the most accurate fit, always measure your child's body rather than relying on age alone — children develop at different rates and fit will vary. International and Australian sizes are shown as age ranges.

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How to Measure — Arena Girls Swimwear
How to take body measurements for Arena girls swimwear

Take all measurements with a soft tape measure, directly against the skin or over light underwear. Measure in centimetres for the most accurate result.

  1. A
    Height — stand straight against a wall without shoes. Measure from the top of the head to the floor in centimetres.
  2. B
    Chest circumference — measure around the fullest part of the chest, keeping the tape measure parallel to the floor.
  3. C
    Waist circumference — measure around the narrowest part of the waistline, usually just above the belly button.
  4. D
    Hips circumference — measure around the fullest part of the hips and seat, keeping the tape parallel to the floor.
Sizing Table — Arena Girls Swimwear
Sizing
UK Size 22 24 26 28 30
International / AUS 6–7 yrs 8–9 yrs 10–11 yrs 12–13 yrs 14–15 yrs
Body Measurements (cm)
A — Height (cm) 116 128 140 152 164
B — Chest (cm) 55 60 65 70 75
C — Waist (cm) 53 55 57 59 60
D — Hips (cm) 65 70 75 80 85

International and AUS sizes are shown as age ranges. Always measure rather than relying on age alone.

Fit Notes — Arena Girls Swimwear
  • Always measure rather than going by age. Children develop at different rates — a child aged 10 may comfortably fit a size 8–9 or 12–13 depending on their build. Body measurements are the most reliable guide.
  • Check the chest measurement first as it is typically the limiting dimension for one-piece swimsuits. A good chest fit with some room in the waist and hips is ideal.
  • Swimwear should feel snug but not restrictive — there should be no excess fabric bunching, and straps should sit flat on the shoulders without digging in.
  • Arena swimwear is made from chlorine-resistant fabric. Rinse in cold fresh water after every swim and allow to dry naturally away from direct sunlight to preserve the fabric and colour.
  • Unsure? Contact our team or call +44 1827 330600. Speak to a member of staff at Allens if you are unsure.
Frequently Asked Questions — Arena Girls Swimwear

Measure your child's height, chest, waist, and hips in centimetres and match these to the size table above. Always use body measurements rather than age, as Arena sizing is based on body dimensions rather than a fixed age range. Speak to a member of staff at Allens if you are unsure.

Arena girls swimwear in this range covers sizes from 6–7 years (UK 22) through to 14–15 years (UK 30), corresponding to heights of approximately 116cm to 164cm. UK sizes are shown in years. If your child is outside this range, please contact our team for guidance on alternative Arena ranges.

Use a soft tape measure taken directly against the skin or over light underwear. Measure height standing straight against a wall, chest around the fullest part, waist around the narrowest point just above the belly button, and hips around the fullest part of the seat. Record all measurements in centimetres and use the size table above to find the best fit.

Arena is a leading competitive swimwear brand and their girls' swimsuits are well suited to training and club swimming. Please note that this size guide covers Arena's training swimwear range, which is made from chlorine-resistant fabric designed to withstand regular pool use and retain its shape and colour over time. Arena does produce a separate range of FINA-approved competition suits for racing, which are constructed differently — if you are looking for a race suit specifically, please contact our team for guidance. For training, choose a size based on your child's body measurements for the best fit.

Rinse the swimsuit thoroughly in cold fresh water immediately after every swim to remove chlorine and salt. Allow to dry naturally away from direct sunlight — do not tumble dry or wring out the fabric. Avoid sitting on rough pool surrounds in the swimsuit as this can damage the fabric. With proper care, Arena's chlorine-resistant fabric will maintain its shape, colour, and performance properties for longer.

Arena's international sizing (France/International) and Australian sizing use age ranges (e.g. 6–7, 8–9). UK sizing uses a numeric year system (e.g. 22, 24, 26). All sizes correspond to the same body measurements — only the labelling differs. Use the body measurement rows in the size table to find the right size regardless of region.