Speedo Fastskin LZR HyperPro Kneesuit Size Guide

This size guide covers the Speedo Fastskin LZR HyperPro Kneeskin — Women's Adult, a World Aquatics approved competition racing kneeskin available in sizes 18–30. The LZR HyperPro delivers all-day comfort combined with moderate compression, engineered to work in synergy with the swimmer and built to last race after race. Designed for all skill levels, strokes and distances — from club and county competition through to regional and national racing.

Key features include comfortable compression engineered for comfort and performance throughout a full competition day, optimised seamlines and bonded dual layers designed and engineered for fit, flexibility and performance, flexible comfort straps anchored with precision to provide stability and a comfortable, unrestricted fit, and shape-retaining lightweight fabric with durable wrapped yarns and water repellant coating — built to last race after race. Fully approved by World Aquatics and developed by Speedo Aqualab. All measurements are body measurements taken directly from your body, not garment measurements.

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Body Measurement Points
Speedo LZR HyperPro Women's Kneeskin body measurement points — body loop, chest, waist and hip diagram
How to Measure

To find the correct LZR HyperPro Kneeskin size, use a soft measuring tape and take all measurements directly against your skin. The Body Loop is the most important measurement for a kneeskin — always measure this first and use it as the primary guide.

  • A
    Body LoopMeasure 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 and determines whether the flexible comfort straps will sit correctly.
  • B
    HipMeasure at the widest part of the hips and seat, keeping the tape horizontal.
  • C
    ChestMeasure across the fullest part of the chest, keeping the tape horizontal.
  • D
    WaistMeasure at the narrowest part of the natural waist.

Note: If your measurements fall across different size brackets, always use the Body Loop as the primary guide. All measurements are body measurements, not garment measurements.

Sizing Table — Women's Fastskin LZR HyperPro 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. If your measurements fall across different size brackets, use the Body Loop as the primary guide.

Fit Notes — Speedo Fastskin LZR HyperPro Kneeskin (Women's)
  • The LZR HyperPro Kneeskin uses moderate compression engineered for all-day comfort and performance — it will feel firmer than a training suit but is designed to be worn comfortably throughout a full competition day, making it an excellent choice for swimmers at any level from club racing to national competition.
  • The Body Loop is the most important measurement for a kneeskin — always measure this first and use it as the primary guide. If your measurements fall across different size brackets, the Body Loop takes precedence.
  • The flexible comfort straps should sit flat across the shoulders with no pulling, twisting, or rubbing. They are anchored with precision to provide stability and a comfortable, unrestricted fit throughout the competition day.
  • The suit should be completely wrinkle-free when correctly fitted. Any bunching or gathering indicates the suit is too large.
  • The bonded dual layers and optimised seamlines should lie flat against the skin with no rubbing or pressure points at any point during 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 on the suit to protect the water repellant coating.
  • Do not use petroleum-based products, oils, sun cream, or body creams before putting on the suit — these degrade the water repellant coating.
  • Rinse in cold fresh water immediately after each use. Do not machine wash, tumble dry, iron, or dry-clean.
  • Store the suit flat and dry, away from direct sunlight, to preserve the shape-retaining fabric and water repellant coating.
  • Unsure? Contact our team or call +44 1827 330600. Speak to a member of staff at Allens if you are unsure.
Frequently Asked Questions — Speedo Fastskin LZR HyperPro Kneeskin (Women's)

Yes. The Speedo Fastskin LZR HyperPro Kneeskin is fully approved by World Aquatics (WA) and is legal for use in all sanctioned competitive swimming events for women. It has been developed by Speedo Aqualab and is built to compete at all levels of the sport, from club and county racing through to national and international competition.

The Speedo Fastskin LZR HyperPro Kneeskin for women is available in sizes 18 to 30. These are Speedo's own sizing system, not standard UK dress sizes, so it is important to use body measurements rather than your usual clothing size. Refer to the sizing table above and use your Body Loop measurement as the primary guide to find the correct size.

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 or twisting during competition.

The Women's LZR HyperPro Kneeskin is the adult version, available in sizes 18 to 30 and cut for an adult female body shape. The Girls' Junior version is available in sizes 26 to 32 and is proportioned for younger swimmers aged approximately 7 to 14. Both suits share the same key features — comfortable compression, flexible comfort straps, bonded dual layers, and World Aquatics approval — but the adult and junior sizing systems are different and should not be interchanged.

The LZR HyperPro Kneeskin should feel firm and compressive but comfortable throughout a full competition day. The flexible comfort straps should sit flat on the shoulders with no pulling or rubbing, the bonded seamlines should lie flat with no pressure points, and the suit should be completely wrinkle-free when correctly fitted. The leg hems should sit above the knee in line with WA regulations. If the suit has any bunching or gathering, it is too large.

The Speedo Fastskin LZR HyperPro Kneeskin is designed for all competitive swimming events and all four strokes. It is engineered to suit all skill levels, strokes and distances, making it an ideal choice for women competing at club, county, regional, or national level who want a reliable, comfortable World Aquatics approved racing kneeskin that performs race after race.

The LZR HyperPro sits within the Fastskin racing range and is designed to deliver all-day comfort with moderate compression, making it suitable for all skill levels and distances. It features flexible comfort straps, optimised seamlines, bonded dual layers, and a shape-retaining lightweight fabric built to last race after race. Swimmers looking for higher compression for elite competition may wish to explore other suits in the Fastskin range — speak to a member of staff at Allens for guidance.

Yes. The LZR HyperPro Kneeskin's moderate compression and all-day comfort make it an excellent choice for a swimmer's first Fastskin racing kneeskin. The flexible comfort straps are anchored with precision to reduce rubbing and provide a comfortable, unrestricted fit throughout a full competition day, making it considerably easier to wear compared to higher compression suits — without sacrificing the performance benefits of a World Aquatics approved tech suit.

The LZR HyperPro Kneeskin is a competition racing suit and is not designed for regular training use. Using it for training will degrade the water repellant coating and reduce the lifespan of the suit significantly. Reserve it for races and competition warm-ups to maintain its performance properties. Speedo offer a wide range of women's training swimsuits designed for everyday pool use.

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, body oils, or petroleum-based products as these degrade the water repellant coating. Consistent care after each use is essential to maximise the lifespan and performance of the suit.