Kneeskin: Understanding the Swimsuit Style in Depth

What is a kneeskin?

The Kneeskin is a one-piece swimsuit designed for competitive racing. It is tight fitting to help you be more streamlined and to enhance your performance in the water. The name “kneeskin” comes from the fact that it extends down to just above your knees. This gives you more cover and can provide compression for your lower body. The compression reduces drag, improves hydrodynamics and gives you support for greater speed and efficiency in the water.

Do you need a Kneeskin for competitive swimming racing?

The simple answer is no. You are not required to wear a kneeskin when you compete currently. In some elite competitive swimming events, you may be required to wear only FINA-approved swimwear. This is not restricted to kneeskins. But these rules are always subject to change, and it is worth checking the rules if you are competing in any high-level competitions. Read our FINA-approved Guide for more information.

Do all Kneesins have Compression?

No. There are kneeskins with only tight-fitting fabrics such as lycra/polyester blend that will fit tightly to your body. To reduce drag and create that streamlined shape. This small compression level is great for new starters and can be used in your first and lower-level swimming competitions. These fabrics do not have water-repellent technology and tend to be more flexible and chlorine resistant. They will last longer and can be used for your warm-ups and occasional training sessions.

Compression kneeskins are made specifically for racing. Their water-repellent, compressive fabrics have varying levels of compression to suit the race level, length, stroke, and your personal preference.

What is the Compression for?

The compression in a racing kneeskin can provide some excellent benefits.

1. Muscle Support: The tight-fitting compression fabric helps to hold muscles in place to reduce muscle oscillation and vibration. This can improve muscle efficiency and reduce fatigue. So, you can maintain your performance for longer.
2. Better Hydrodynamics: With a compressive tight fit you are further streamlined reducing drag and water resistance. Allowing you to move through the water more efficiently.
3. Body Position Support: The compressive kneeskin can assist in maintaining horizontal alignment, keeping the lower body from sinking and improving technique.
4. Improved Blood Circulation: The pressure exerted by the tight fit can enhance blood flow, helping to deliver oxygen and nutrients to your muscles more efficiently. To help with muscle performance and recovery.

Racing kneeskin’s have varying levels of compression. This can change between brands and their products. You must find a level of compression that you can work with comfortably. For your personal preferences and swimming situation. Typically, the highest levels of compression are aimed at sprinters. Slightly lower levels of compression provide more flexibility for longer races.

How long should my Compression Kneeskin last?

The lifespan of a compression kneeskin depends on many factors. You need to consider the quality of the swimsuit, how you care for it, frequency of use and your habits. Typically, they can last several months up to one year if used regularly. You need to consider that the compression will diminish over time and each time you wear it, and that chlorine will degrade the fabric.

Read our race suit care guide for more information on how to get the most from your kneeskin.

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Rules

Recently some technical race suits including some kneeskins were banned in Scotland for swimmers aged 13 and under. This includes compression kneeskins that have all three of the following features. A water-repellent compressive fabric, bonded seams, and leg grippers. Check out their rules here.