■ Product Name / Tension adjustment buckle & Rubber belt ☆ Selling Point Superior to the old-fashioned nylon weight belts. ■ Weight Belt Considerations Whether for scuba diving or freediving, when attaching a general weight belt with lead weights, which are commonly found in existing products, to the body, even though it was fitted perfectly, you may notice that it has slipped down from the position it was originally worn. In freediving, this can lead to having to readjust the belt while floating on the surface or during a fun dive, or to correct the position of the shifted weights, which can be a source of increased stress when you want to fully concentrate on enjoying the underwater experience. The reason why the weight belt attached to the body loosens is that the wetsuit material is made of a material with numerous air bubbles. When descending underwater, the air bubbles in the wetsuit material are compressed by water pressure, causing the material itself to contract. Therefore, even if you fit the weight belt to your body on land, it is theoretically impossible for existing weight belts to maintain their position when entering the water. ■ Buckle & Rubber Belt Features A strong spring is incorporated into the internal mechanism of the buckle. As you descend underwater, the spring utilizes the force (elasticity) that tries to return to its original state from the stretched state of the wetsuit material, which is compressed by the water pressure. The buckle itself automatically corrects the tension applied to the belt. By simply applying tension to the spring inside the buckle before entering the water, the weight belt will always stay in place without shifting, even in freediving, where you repeatedly descend and ascend. The belt material is a familiar rubber belt for spearfishermen, but it is a material with low recognition among scuba divers who have only used nylon weight belts. It is made of rubber using the same manufacturing method as tires, with a unique blend of natural rubber, graphite powder, and vulcanizing agents, placed in a mold and hardened by high-temperature steam pressure. Similar to the durability of tires, the weight belt will not stretch during diving. ■ Size Belt Length: Approximately 150 cm ■ It employs a buckle with a "quick-release mechanism," which is an absolute requirement for weight belts used in diving.