Arena Powerskin Impulso Boys Size Guide

This size guide covers the Arena Powerskin Impulso Boys’ Jammer — the perfect solution for the junior swimmer seeking an affordable entry into performance racing swimwear. The Impulso’s woven fabric is designed to give moderate compression, supporting the muscles and improving the hydrodynamic position of the body in the water.

Its lightweight and quick-drying properties, together with a hydrophobic treatment and flat surface, minimise water absorption and surface resistance to further improve hydrodynamics. An excellent choice for junior swimmers competing regularly at club level who want a performance suit at an accessible price point. All measurements are body measurements taken directly from your child’s body. Use the Hip (B) as the primary sizing guide. Age ranges are shown as a guide only.

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Body Measurement Points
Arena Arena Powerskin Impulso Boys' Jammer boys body measurement points — waist and hip
How to Measure

Take all measurements directly against your child’s skin using a soft tape measure. Use the Hip (B) as the primary sizing guide. Age is shown as a guide only — always use body measurements as children develop at very different rates.

  • A
    WaistMeasure at the narrowest part of the natural waist, keeping the tape horizontal and level.
  • B
    HipMeasure around the fullest, widest part of the hips and seat, keeping the tape horizontal.

If measurements fall between sizes, speak to a member of staff at Allens who will be happy to advise on the best fit.

Sizing Table — Arena Powerskin Impulso Boys' Jammer
Sizing 22 24 26 28
International Size Equivalents
UK 22 / 6–7 yrs 24 / 8–9 yrs 26 / 10–11 yrs 28 / 12–13 yrs
USA 22 24 26 28
France / Italy 6–7 yrs 8–9 yrs 10–11 yrs 12–13 yrs
Germany (height cm) 116 128 140 152
Body Measurements (cm)
A — Waist 54–56 56–59 59–62 62–65
B — Hip 60–64 65–69 71–75 78–82

Age ranges are a guide only. All measurements are body measurements, not garment measurements. Use the Hip (B) as the primary sizing guide. Speak to a member of staff at Allens if you are unsure.

Fit Notes — Arena Powerskin Impulso Boys' Jammer
  • Always use body measurements to select the correct size — age ranges are a guide only as children develop at very different rates.
  • Use the Hip (B) as the primary sizing guide — the jammer needs to seat correctly over the hips before the waistband can sit flat.
  • If measurements fall between sizes, speak to a member of staff at Allens who will be happy to advise on the best fit.
  • The moderate compression of the Impulso makes it an accessible first step into performance racing suits for junior swimmers — supportive and close-fitting without being uncomfortably tight.
  • The hydrophobic surface treatment minimises water absorption — avoid contact with sunscreen and oils which can degrade this treatment over time.
  • The flat surface construction should lie smooth against the skin with no wrinkling — any gathering indicates the suit is too large.
  • The suit should be completely wrinkle-free when correctly fitted — any bunching or gathering indicates the suit is too large.
  • The waistband should sit flat with no rolling. Leg hems should end above the knee in line with World Aquatics regulations.
  • Allow 10–15 minutes to put on correctly for the first time. Take care with fingernails and jewellery to protect the fabric.
  • Do not use sunscreen, oils, or petroleum-based products before putting on the suit as these degrade the fabric.
  • Rinse in cold fresh water immediately after each use. Do not machine wash, tumble dry, iron, or dry-clean.
  • 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 Powerskin Impulso Boys' Jammer

Measure your child’s waist (A) and hip (B) using a soft tape measure directly against the skin. Use the hip measurement as the primary guide and compare both to the sizing table above. Age is shown as a guide only — always use body measurements as children develop at very different rates. Speak to a member of staff at Allens if you are unsure.

Always select by body measurements. The age ranges shown are a guide only — children develop at very different rates and age alone is not a reliable indicator of the correct size. Measure the waist and hip and compare to the sizing table, using the hip as the primary guide.

If your child’s measurements fall between two sizes, speak to a member of staff at Allens who will be happy to advise on the best fit. Arena racing jammers are designed to fit closely — a suit that fits correctly should feel firm and supportive without restricting breathing or movement.

A junior racing jammer should feel firm and compressive but comfortable throughout a full competition day. It should be completely wrinkle-free when correctly fitted — any bunching or gathering indicates the suit is too large. The waistband should sit flat with no rolling, and leg hems should end above the knee in line with World Aquatics regulations.

Yes — the Arena Powerskin Impulso and ST Next meet FINA/World Aquatics specifications and are approved for use in all sanctioned competitive swimming events. Always check with your event organiser for any local age group rules regarding tech suits in competition. Speak to a member of staff at Allens if you need further guidance.

Arena racing jammers are competition suits and are not designed for regular training use. Using a tech suit for training will degrade the fabric and reduce its lifespan significantly. Reserve it for races and competition warm-ups. Arena offer a wide range of junior training jammers for everyday pool use.

Rinse the suit in cold fresh water immediately after every use. Do not machine wash, tumble dry, iron, or dry-clean. Store flat and dry, away from direct sunlight. Avoid contact with sunscreen, oils, and petroleum-based products. Do not wring or twist the suit. Handle with care when putting on and taking off to protect the fabric.

Arena junior racing suit sizes (22–28) do not directly correspond to standard clothing sizes. The sizing is based on body measurements — always use waist and hip measurements to select the correct size. The international size equivalents shown in the table are provided as a secondary reference only.