News:Announcement of New Materials for Triathlon Wetsuits and Competitive Swimwear
May 14, 2014

Yamamoto Corporation, the special composite synthetic rubber material manufacturer and medical equipment manufacturer, has made significant improvements to the materials used in making triathlon wetsuits—which the company boasts the top share in the world—and also to the material—featuring the world's lowest water resistance—used in manufacturing competitive swimwear.

1. Triathlon
Yamamoto Corporation has developed a new wetsuit fabric that decreases resistance by adjusting to water flow. The company simultaneously developed another wetsuit fabric that increases the amount of water to be pushed backwards by the user's inner arms. Because of these new materials, our triathlon wetsuits will dramatically increase the wearer's performance. In particular, there are two major factors at play.
(1) Fundamental review of rubber materials! New No. 40 rubber replaces No. 39 rubber!
Wetsuit material Model No. 39 features an apparent specific gravity (buoyancy) at least 35% lighter than any other material in the world. Model No. 40 retains this buoyancy but was designed after a fundamental review of No. 39's tensile stress, and reduces stress on the wearer's muscles by more than 20% in comparison.

(2) Look at the different surfaces! From smooth to intelligent!
Until now, wetsuit surface textures have been conventionally smooth or flat. Yamamoto Corporation, however, created more than 100 prototypes, and studied which surfaces among these would best suppress the disturbance of water flow underwater.

Some examples showed decreased resistance and up to a 30% improvement in comparison with existing products.
  • Battle plane wing pattern distributes water via up to 60 degrees (angle).
  • Honeycomb geometry pattern distributes water in equal 60 degree directions.
  • Inverted wing pattern can partly heighten water resistance through movement of inner arms.
Yamamoto Corporation has fast-tracked production of the above-mentioned materials and will soon commence sales via wetsuit manufacturer Natural Energy Inc.

2. Competitive Swimming
Since the 2008 Beijing Olympics, Yamamoto Corporation has supplied the world with the material used in competitive swimwear (officially approved by FINA) which minimizes water resistance by using a unique technology to make its surface hydrophilic (water resistant) to 0.021 cdf. In doing so, we focused in part on whether or not resistance (stress) between the swimwear and the wearer's skin during competition was excessive.
The inner surface of water-repellent swimwear displays a water resistance of approx. 2.0 to 2.5 cdf. which correlates to the 2.0 cdf water resistance of human skin, thus identifying major stress between the two. With the completion of a material for high-performance competitive swimwear, we minimized this stress to significantly improve the wearer's speed and reduce muscle fatigue. Water resistance for the surface of the new swimwear material is as follows:

(1) Frictional resistance coefficient between the surface of new competitive swimwear and water "0.021 cdf"!
Realizes ultralow resistance approaching the surface of ice.
The moment the athlete jumps into water, water molecules appear on the surface of our swimwear and water resistance measures 0.021 cdf. With normal water-repellent swimwear featuring a water resistance of "1.8 cdf", the new material boasts a water resistance one-85th of that.

(2) Water resistance between skin and the interior of new competitive swimwear is "0.08 cdf"!
Decreased the water resistance between the skin and inside of new competitive swimwear to one-25th of that of conventional water-repellent swimwear.
Through this breakthrough improvement, stress is dramatically reduced on the athlete's skin and muscles during competitive swimming. We have succeeded to create the "swimwear material of our dreams".

Yamamoto Corporation has fast-tracked production of the above-mentioned materials and will soon commence sales via competitive swimwear manufacturer MERLIN.

Press Conference

We hope to support athletes with these new materials, wetsuits and competitive swimwear at the Tokyo 2020 Olympics.

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