Speedo Fastskin LZR Ignite Kneesuit Size Guide

This size guide covers the Speedo Fastskin LZR Ignite Openback Kneeskin — a World Aquatics approved women's competition racing kneeskin designed to feel comfortable throughout long race meets. Part of Speedo's Fastskin LZR range, the LZR Ignite Kneeskin offers all the benefits of a racing suit with moderate compression and a softer, more comfortable feel from box to blocks. Whether you are racing hard or supporting your teammates across a full competition day, the LZR Ignite Kneeskin delivers race-ready performance without the restrictive fit of a maximum compression suit.

Key features include Flexible Comfort Straps designed to reduce skin rubbing for a comfortable and unrestricted fit during long race meets, 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 you glide through the water at speed, and LZR Pulse multi-directional stretch fabric with a water-repellent finish for flexibility without compromising performance. The suit is also durable and designed to retain its shape for a race-ready fit, time after time. Tested and developed to meet the needs of real swimmers, and fully approved by World Aquatics. All measurements are body measurements taken from your own body, not garment measurements.

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

To find your correct Speedo Fastskin LZR Ignite Openback Kneeskin size, use a soft measuring tape and take all measurements directly against your skin. The Body Loop measurement is particularly important for kneeskins — if you are on the larger end of your size, this will determine whether the Flexible Comfort Straps sit correctly on your shoulders without pulling.

  • 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 your hips and seat, keeping the tape horizontal.
  • C
    Chest Measure across the fullest part of your chest, keeping the tape horizontal.
  • D
    Waist Measure at the narrowest part of your natural waist.

Note: The 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 less restrictive than Speedo's maximum compression Fastskin suits such as the LZR Pure Intent 2.

Sizing Table — Women's Fastskin LZR Ignite Openback Kneeskin
Size 18 Size 20 Size 22 Size 24 Size 26 Size 28 Size 30
Body Measurements
Body Loop cm 138.0–143.5 143.5–149.0 149.0–154.5 154.5–160.0 160.0–165.5 165.5–171.0 171.0–176.5
Chest cm 73.5–79.0 79.0–84.5 84.5–90.0 90.0–95.5 95.5–101.0 101.0–106.5 106.5–112.0
Waist cm 53.0–58.5 58.5–64.0 64.0–69.5 69.5–75.0 75.0–80.5 80.5–86.0 86.0–91.5
Hip cm 76.0–81.5 81.5–87.0 87.0–92.5 92.5–98.0 98.0–103.5 103.5–109.0 109.0–114.5

All measurements are body measurements, not garment measurements.

Fit Notes — Speedo Fastskin LZR Ignite Openback Kneeskin
  • The Speedo Fastskin LZR Ignite Openback Kneeskin uses moderate compression and is designed to feel comfortable throughout a long race meet — it will feel firmer than a training suit but significantly less restrictive than maximum compression Fastskin suits such as the LZR Pure Intent 2.
  • If your measurements fall into different size brackets, use your hip measurement as the primary guide, as the kneeskin needs to seat correctly over the hips before the rest of the suit can align properly.
  • 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 long competition days.
  • 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, keeping the leg opening in place during racing without digging in.
  • The leg hems should end above the knee in line with WA regulations and feel snug but not restrict blood flow.
  • Allow up to 10–15 minutes to try on correctly. Take care with fingernails and jewellery when pulling up the suit to avoid damaging 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 LZR Ignite Openback Kneeskin

Yes. The Speedo Fastskin LZR Ignite Openback Kneeskin is fully approved by World Aquatics (WA) and is legal for use in all sanctioned competitive swimming events, including club, county, national, and international competitions. Always check with your event organiser for any additional local or federation rules.

The LZR Ignite Kneeskin sits at a different point in Speedo's Fastskin LZR range. The Pure Intent 2 offers maximum compression with bonded ergonomic seams for elite sprint racing, and the Pure Valor 2 offers moderate compression with 6x more lasting water repellency for distance and multi-event swimmers. The LZR Ignite is designed for swimmers who want all the benefits of a racing kneeskin with a softer, more comfortable fit — making it ideal for long race meets, younger competitive swimmers stepping up to a tech suit, or those who want a race-legal kneeskin that can be worn comfortably throughout the whole competition day.

The LZR Ignite Kneeskin should feel firm and compressive but comfortable — noticeably tighter than a training suit but less restrictive than Speedo's maximum compression Fastskin suits. The Flexible Comfort Straps should sit flat across 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. It is designed to be worn comfortably throughout a full day of competition.

We recommend selecting your size based on your body measurements — using your 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 your body, under your crotch, and back up to the same shoulder. This measurement determines the torso length of the suit and is important for a kneeskin, as it determines whether the Flexible Comfort Straps will sit correctly on your shoulders without pulling or causing discomfort during a long race meet.

The Speedo Fastskin LZR Ignite Openback Kneeskin is suited to all competitive swimming events and all four strokes. It is particularly well suited to swimmers competing across multiple events in a day, or those attending long race meets where all-day comfort is as important as race performance. It is a popular choice for club and county-level competitive swimmers and those stepping up to a Fastskin racing kneeskin for the first time.

Yes. The Speedo Fastskin LZR Ignite Kneeskin is a popular choice for younger competitive swimmers stepping up to a Fastskin racing suit for the first time. Its moderate compression, Flexible Comfort Straps, and softer overall fit make it easier to put on and wear throughout a long competition day compared to maximum compression suits. It is World Aquatics approved and suitable for use in all sanctioned competitions.

The 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 endurance training swimsuits. Reserve the LZR Ignite Kneeskin 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.

The LZR Ignite Kneeskin combines race-ready performance with all-day comfort. Key features include Flexible Comfort Straps that reduce skin rubbing for an unrestricted fit during long race meets; compressive woven fabric, leg grippers, and bonded dual-layer inner panels for a race suit look and feel; advanced water-repellent coating for speed through the water; LZR Pulse multi-directional stretch fabric with a water-repellent finish; and a durable construction designed to retain its shape for a race-ready fit time after time. It is tested and developed to meet the needs of real swimmers at every level of competition.