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UMMY, which revolutionized the Japanese free diving scene, and Navy Apparel, an apparel brand for sea lovers, have finally collaborated! The stylish and high-quality carbon fin UMMY ONE has been fused with NAVY Apparel's unique and sophisticated design to create a beautiful fin that overturns the conventional wisdom of carbon fins! The mask worn by the mermaid is a playful design that is UMMY's best-selling Streamline.
These premium fins are stylish for both men and women and will make your ocean life even more enjoyable.

VY Great L
From a young age, he grew up in an environment close to the sea, with the Kansai diving shop "Navy Company" as his playground.
While working at the Navy Company, he launched Navy Apparel at the age of 27.
In collaboration with Orion Beer and others, he creates colorful designs centered around fish and the sea.
Yu K Junior
Age 35
Dive image
UMMY ONE Side Story

Meet Prussian Blue
It took two years from conception to launch of the UMMY carbon fin. The number of sample fins required was several dozens of sets... UMMY does not have its own manufacturing plant, so they negotiated, planned and developed with fin manufacturers around the world, and finally made a fateful encounter with Prussian Blue, a top fin manufacturer in Taiwan.
Technical ability x Execution ability
The reliable quality of the fins developed by Prussian Blue, the innovativeness of the foot pockets developed by the company, and above all, UMMY's willingness to flexibly respond to the high demands that UMMY has for fins were the deciding factors that led UMMY to enter into a strategic partnership with the company. It was at this moment that UMMY was convinced that the best fins could be made by combining UMMY's execution ability to meet customer needs with Prussian Blue's technical capabilities.


UMMY's fin
UMMY aims to create fins that will satisfy all divers who love diving, including free divers, skin divers, and spear fishers. In order to achieve this goal, we spent a year trying and testing everything from design, color variations, functionality, foot pockets, and price to a complete review, and we were able to successfully develop fins that UMMY owners themselves were satisfied with.
Origin of UMMY ONE
ONE is a word that means starting from scratch, and "Ichiban" is a word that means the top or the peak. We named it UMMY ONE with the desire to always keep moving forward without forgetting the first step we took and to aim to become the most beloved fin in the world in the future.

UMMY ONE's commitment

Fins are all about lightness. Up until now, even the lightest carbon fins weighed about 600g per foot, but UMMY one weighs only about 400g. The weight reduction of about 200g has made it possible to greatly reduce the burden on divers. You will feel the difference in everything, from skin diving, free diving training, to kicking in free diving competitions. When you pick it up, you will be surprised at how light it is. In addition, the special processing of the foot pocket makes it float on the water surface, so you no longer have to worry about it sinking into the sea.

UMMY ONE is made by bonding carbon with Plussian Blue's unique special technology. This makes it a fin that can obtain maximum efficiency and maximum propulsion. The blade diameter is 75cm and the blade angle is 26°. If the blade diameter is too long, the efficiency of the fin kick decreases and the burden on the foot increases. UMMY ONE emphasizes efficiency and ease of handling, and has been able to meet the needs of many divers by making the blade length that can achieve maximum efficiency with one kick and the 26° angle that can handle all dives, including parallel movement on the surface and underwater, and vertical diving.

UMMY products must always be stylish. UMMY ONE uses the UMMY symbol mark for the blade tip and the carbon laminate design on the back. The blade cut is perfectly balanced with the symbol mark to create a beautiful, one-of-a-kind fin.

To meet the needs of many divers, the logo type can be selected from two types: BIG UMMY with a large logo and SMALL UMMY with a small logo. Each type is available in five rich colors.

The new Foot Pocket X1 from Prussian Blue is a well-balanced trinity of art that is easy to wear, comfortable to wear, and a good kicking sensation. The foot pocket is soft and stretches very well, so you can wear it with bare feet or 2mm socks in the same size.
Order Step

There are two types of hardness: soft and medium. As a guideline, soft is recommended for people weighing up to 70kg or less than 50kg with strong legs, and medium is recommended for people weighing over 70kg or less than 70kg with strong legs.

Available in two colors: black and white

Available in two colors: black and white (white only is expected to arrive in July-August) *May be available after August

There are 6 sizes in total. If you are having trouble choosing a size, please use our foot pocket rental service. If you purchase within 6 months of using the rental service, we will give you a cashback on the rental fee.
Frequently asked questions
Since this is made to order, it will take about one and a half to two and a half months. (It may be earlier or later than that.) Therefore, please order with plenty of time. The type with a white logo and the UMMY one short are relatively quick and can usually be delivered within about one month.
Size exchanges are possible, but as there is a charge for the foot pocket as well as the round-trip shipping fee to Taiwan, we recommend that you use the foot pocket rental service to avoid making a mistake in the size.
Although there will be a shipping charge to Taiwan and back, an exchange is possible.
Please refer to EU and Japanese sizes to select your size. The foot pocket stretches well, so basically any 2mm socks will fit in the same size. If you are unsure of the size, please use our foot pocket rental service. *Service only available in Japan
The warranty period for blades is 3 years from the date of order. Please make sure to keep a copy of your purchase information (order number, name). If the blades are cracked or chipped due to normal use, we will replace one pair free of charge. *As the blades are shipped to Taiwan, it may take 1-2 months for the replacement. *Foot pockets and water rails are not covered by the warranty.
We will only accept returns or exchanges if the product is defective or the wrong product has been sent. We cannot accept returns or exchanges due to customer preferences.
Carbon blades are lightweight and have great propulsive power, but they are also very delicate. Please handle them with care as they may crack or break if they hit rocks or coral. Also, do not dive into the water from a boat as the blades may break. After use, wash them immediately under running water and dry them in the shade, avoiding direct sunlight.
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