For delicious beer -RIVERET-

A sake vessel made for beer

Maximize the flavor of your beer. Beer vessels born from considering the characteristics of beer.

Beer is loved across all borders, including countries, genders, lifestyles, scenes, and generations. Its appeal is that it is popular and can be enjoyed casually, but it actually has very delicate characteristics. RIVERET's product development begins with understanding the characteristics of the beer.

Even for the same brand, there is a clear difference in taste between draft beer, bottled beer, and canned beer. The latter is more likely to come into contact with air during the shipping process, causing oxidation and deterioration. The reason that "draft beer" served at restaurants is said to be delicious is because it barely comes into contact with air from the brewing process until it is poured into the glass. However, the advantage of bottled and canned beer is that it can be enjoyed at home. How can you casually enjoy it without compromising the original flavor of the beer? This is where the perspective of RIVERET, a tableware manufacturer, really shines.

Beer is poured into a mug or glass. It tastes good at first, but by the last sip, the flavor is half gone. I'm sure many of you have noticed this difference in taste. There are two main reasons for the deterioration of flavor: temperature changes due to the influence of the outside air, and oxidation that occurs when the beer comes into contact with air. If you drink it directly from a bottle or can to prevent oxidation, the beer will be more carbonated than necessary, and the tingling sensation will overwhelm the mellowness, richness, and sweetness.

To enjoy bottled or canned beer at home more deliciously, always pour it into a mug or glass. By gently pouring moderately chilled beer without foaming it, the beer will generate carbonation and create fine bubbles. This foam acts as a lid to prevent the release of aroma and oxidation. Protected from oxidation, this state in which the beer releases the right amount of carbonation creates the perfect balance of sharp bitterness and rich sweetness.

First, RIVERET focused on the temperature change caused by the material of the vessel itself. For example, in the case of glass, ceramic, or stainless steel, which have high thermal conductivity, you can take advantage of this property and enjoy the vessel itself ice cold. However, this also means that it is easily affected by the outside temperature and heats up quickly. This means that there can be a difference between the first sip and the last sip.

It is important that the vessel into which beer is poured is not easily affected by the outside temperature (high heat retention). For this reason, RIVERET chose a natural material (wood). To date, they have compared the thermal conductivity of various types of wood, including cedar, maple, cherry, oak, and walnut. Low-density wood such as cedar has high heat retention because it contains more air, but it has problems with strength. In contrast, high-density wood such as maple has high heat retention compared to glass and ceramics, but it seems that these characteristics are not fully utilized.

However, out of all the materials, bamboo achieved high values for both heat retention and strength. Bamboo is said to be a grass, not a type of wood. Unlike trees, bamboo is made up of the same straw-like tubes called xylems as grass and leaves, which are bundled together in a straight line. The xylems, which are regularly bundled on a microscopic level, contain just the right amount of air, yet are more than twice as strong as regular wood. This is where RIVERET began developing a bamboo container specifically for beer.

When you look at a cross section of bamboo, you can see that it is composed of countless straw-like vessels. The tiny spaces contained within these vessels create layers of air that increase the warmth inside, just like a down jacket.

Another challenge was how to delay oxidation. The shape of the vessel into which the beer is poured is important in maintaining the optimal balance of taste and aroma for as long as possible. RIVERET paid particular attention to the interior surface treatment and unique shape lines. By shrinking the area near the opening, the aroma is trapped and oxidation is prevented. The slope is steeper near the center of the interior, encouraging the remaining bubbles to drop further and further down, designed to maintain the cap of bubbles as long as possible.

A comparison between a glass cup and RIVERET, after about two sips. What is particularly noticeable with RIVERET is the amount of foam remaining on the surface of the beer. The inclined interior and hand polishing create a mechanism that allows the foam to flow downwards without adhering to the sides or stagnating.
(This is our own opinion only.)

The finishing touches are the work of a craftsman

The finer the foam, the longer it will last. If the surface of the vessel is too rough, the bubbles will be crushed and will combine to form larger bubbles, which will make them more likely to break. In the final stage of the RIVERET manufacturing process, the vessel is finely polished by hand by a craftsman. This delicate technique preserves as much of the fine foam produced by the beer as possible, while promoting just the right amount of foaming.

Naturally, the appearance and texture of the beer will change depending on the material. When it comes to the first sip of beer under the midsummer sun, nothing can beat glass. However, the strength of RIVERET, a natural material, is that it allows you to enjoy the original flavor of beer consistently throughout the four seasons.