Speedo Junior Fastskin LZR Ignite Kneesuit Size Guide

This size guide covers the Speedo Fastskin Junior LZR Ignite Openback Kneeskin — a World Aquatics approved girls' competition racing kneeskin designed to feel comfortable for young swimmers during long race meets. The Junior LZR Ignite shares the same look, feel, and technology as the adult LZR Ignite, offering all the benefits of moderate compression without the restrictive fit — making it the ideal first Fastskin racing suit for junior competitive swimmers aged 7 to 14.

Key features include Flexible Comfort Straps to reduce skin rubbing for a comfortable and unrestricted fit throughout the competition day, compressive woven fabric, leg grippers, and bonded dual-layer inner panels that deliver the look and feel of a racing suit from box to blocks, advanced water-repellent coating to help young swimmers glide through the water at speed, and LZR Pulse multi-directional stretch fabric with a water-repellent finish. The suit is also durable and designed to retain its shape for a race-ready fit, time after time. Fully approved by World Aquatics for use in all sanctioned competitions. All measurements are body measurements taken from your child's body, not garment measurements.

Please note: this style is created through a digital printing technique — each suit is individually crafted with a unique print application each time. Your print will differ slightly to the one worn by our model.

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Body Measurement Points
Speedo Fastskin Junior LZR Ignite Kneeskin body measurement points — body loop, chest, waist and hip diagram for girls
How to Measure

To find the correct Speedo Fastskin Junior LZR Ignite Kneeskin size, use a soft measuring tape and take all measurements directly against your child's skin. Age is shown as a guide only — always use body measurements to find the correct size, as children develop at different rates. The Body Loop is the most important measurement for a kneeskin.

  • A
    Body Loop Measure over one shoulder, down the front, under the crotch and back up to the same shoulder. This gives the torso length needed for a kneeskin.
  • B
    Hip Measure at the widest part of the hips and seat, keeping the tape horizontal.
  • C
    Chest Measure across the fullest part of the chest, keeping the tape horizontal.
  • D
    Waist Measure at the narrowest part of the natural waist.

Note: Ages shown in the sizing table are a guide only. Always measure and use body measurements to select the correct size. Children of the same age can vary significantly in size.

Sizing Table — Girls' Fastskin Junior LZR Ignite Openback Kneeskin
Size 26 Size 28 Size 30 Size 32
Age (guide only) 7–8 yrs 9–10 yrs 11–12 yrs 13–14 yrs
Body Measurements
Body Loop cm 117–124 125–132 133–140 141–145
Chest cm 66.0–70.0 71.0–74.0 75.0–79.0 80.0–84.0
Waist cm 59.0–61.5 62.0–64.5 65.0–67.0 68.0–70.0
Hip cm 70.0–74.5 75.0–79.5 80.0–84.5 85.0–89.5

Ages shown are a guide only. Always use body measurements to select the correct size. All measurements are body measurements, not garment measurements.

Fit Notes — Speedo Fastskin Junior LZR Ignite Openback Kneeskin
  • The Speedo Fastskin Junior LZR Ignite Kneeskin uses moderate compression and is designed to feel comfortable throughout a long race meet. It will feel firmer than a training suit but is significantly more comfortable than maximum compression Fastskin suits — making it ideal for junior swimmers at their first competition or first tech suit experience.
  • Always use body measurements to select the correct size — the age guide in the table is indicative only, as children develop at very different rates. A child at the upper end of a size range may need the next size up.
  • If measurements fall across different size brackets, use the hip measurement as the primary guide, as the kneeskin needs to seat correctly over the hips before the rest of the suit can align.
  • The Flexible Comfort Straps should sit flat and comfortable across the shoulders with no pulling, twisting, or skin rubbing. They are specifically designed to reduce strap irritation during a full day of competition.
  • The suit should be completely wrinkle-free when correctly fitted. Any bunching or excessive gathering indicates the suit is too large.
  • The leg grippers should sit snugly at the top of the thigh without digging in, keeping the leg openings in place throughout racing.
  • The leg hems should end above the knee in line with WA regulations and feel snug but not restrict movement or blood flow.
  • Allow 10–15 minutes to try on correctly for the first time. Take care with fingernails and jewellery when pulling up the suit to protect the water-repellent coating.
  • Do not use petroleum-based products, oils, or creams before putting on the suit — these degrade the water-repellent coating.
  • Rinse in cold fresh water immediately after each use. Do not tumble dry, iron, or dry-clean.
  • Unsure? Contact our team or call +44 1827 330600.
Frequently Asked Questions — Speedo Fastskin Junior LZR Ignite Openback Kneeskin

Yes. The Speedo Fastskin Junior LZR Ignite Openback Kneeskin is fully approved by World Aquatics (WA) and is legal for use in all sanctioned competitive swimming events. Always check with your event organiser or club for any additional age group or local rules regarding the use of tech suits in junior competition.

The Speedo Fastskin Junior LZR Ignite Kneeskin is available in sizes 26 to 32, covering an approximate age range of 7 to 14 years. However, age is a guide only — always use body measurements to select the correct size, as children of the same age can vary significantly in size. If your child's measurements fall between two sizes, speak to a member of staff at Allens for guidance.

The Speedo Fastskin Junior LZR Ignite Kneeskin shares the same look, feel, and technology as the adult LZR Ignite — including Flexible Comfort Straps, moderate compression, compressive woven fabric with leg grippers, bonded dual-layer inner panels, advanced water-repellent coating, and LZR Pulse multi-directional stretch fabric. The junior version is proportioned and sized specifically for younger swimmers aged 7 to 14, and features digital print designs created through a unique print application process.

Always select by body measurements. The age ranges shown in the sizing table are a guide only — children develop at very different rates and a child's age alone is not a reliable indicator of their correct size. Measure the body loop, chest, waist, and hip and compare to the sizing table above, using the hip measurement as the primary guide. Speak to a member of staff at Allens if you are unsure.

The Body Loop is measured by running a soft tape measure over one shoulder, down the front of the body, under the crotch, and back up to the same shoulder. This is the most important measurement for a kneeskin, as it determines the torso length and whether the Flexible Comfort Straps will sit correctly on the shoulders without pulling during competition.

The Junior LZR Ignite Kneeskin should feel firm and compressive but comfortable — noticeably tighter than a training suit but designed to be worn comfortably throughout a full day of competition. The Flexible Comfort Straps should sit flat on the shoulders with no pulling or rubbing, the leg grippers should hold the leg openings in place without digging in, and the suit should be completely wrinkle-free when correctly fitted.

The Speedo Fastskin Junior LZR Ignite Kneeskin is suited to all competitive swimming events and all four strokes. It is designed for young swimmers competing at club, county, or regional level who want the benefits of a racing kneeskin with a comfortable, unrestricted fit throughout the whole competition day.

The Junior LZR Ignite Kneeskin is a competition racing suit and is not designed for regular training use. Using it for training will degrade the water-repellent coating and shorten the lifespan of the suit. For training, Speedo offer a wide range of junior training swimsuits. Reserve the Junior LZR Ignite for races and competition warm-ups to maintain its performance and durability.

Rinse the suit thoroughly in cold fresh water immediately after every use to remove chlorine and salt. Do not machine wash, tumble dry, iron, or dry-clean. Store the suit flat and dry, away from direct sunlight. Avoid contact with sun cream, fake tan, or petroleum-based products as these will degrade the water-repellent coating. The LZR Ignite is designed to retain its shape over time, but regular care after each use is essential to maximise the lifespan of the suit.

Not exactly. The Junior LZR Ignite Kneeskin is created using a digital printing technique where each suit is individually crafted with a unique print application. This means your child's suit will have a slightly different print pattern to the one shown on the model or in the product images — but will feature the same colours and overall design. This is a normal characteristic of this product.