Abstract: A corrective lens for diving masks is revealed. The corrective lens for diving masks includes a corrective lens body locked on a frame of a diving mask by a locking part. Thus the corrective lens body is stacked over a surface on one side of the lens of the diving mask for improving users' vision. Moreover, the corrective lens body can be rotated horizontally in relative to the surface of the lens of the diving mask for position adjustment and vision correction. Thus the corrective lens for diving masks features on simple structure and convenience of use.

Abstract: A snorkel for users floating or skin diving on the sea is disclosed. The snorkel includes an inlet tube, a mouthpiece chamber and a mouthpiece. A comber impermeable cap with a first valve is arranged on a top end of the inlet tube while a bottom end of the inlet tube is sleeved with an inlet end of the mouthpiece chamber. A baffle is disposed inside the mouthpiece chamber so as to form an upper chamber and a lower chamber. A second valve is arranged on the inlet end of the mouthpiece chamber so as to make air flow into the mouthpiece chamber or the upper chamber. At least one third valve is arranged on a corresponding outlet end so that air or water is exhausted from the mouthpiece chamber. A mouthpiece is sleeved on top surface of the mouthpiece chamber. The exhaled waste air is unable to enter the inlet tube and is exhausted only through the third valve. Therefore, users can breathe in/out easily without water inhalation or hypoxia.

Abstract: A snorkel for users floating or skin diving on the sea is disclosed. The snorkel includes an inlet tube, a mouthpiece chamber and a mouthpiece. A comber impermeable cap with a first valve is arranged on a top end of the inlet tube while a bottom end of the inlet tube is sleeved with an inlet end of the mouthpiece chamber. A baffle is disposed inside the mouthpiece chamber so as to form an upper chamber and a lower chamber. A second valve is arranged on the inlet end of the mouthpiece chamber so as to make air flow into the mouthpiece chamber or the upper chamber. At least one third valve is arranged on a corresponding outlet end so that air or water is exhausted from the mouthpiece chamber. A mouthpiece is sleeved on top surface of the mouthpiece chamber. The exhaled waste air is unable to enter the inlet tube and is exhausted only through the third valve. Therefore, users can breathe in/out easily without water inhalation or hypoxia.

Abstract: A swim fin that changes down kick force is revealed. The swim fin worn over the foot to aid movement through the water includes a footpocket and a flat fin blade. The flat fin blade extends from the front part of the footpocket and has an upper blade surface and a lower blade surface. At least one blade surface is disposed with two fin ribs arranged symmetrically. By being embedded with heavy objects inside the fin rib, the weight of the swim fin is increased so as to increase the force of the swim fin acted on the water by kicking. This favors down kick of legs and the propelling force of kick is increased so that the user is allowed to move faster in the water with the swim fin.

Abstract: A strap for use with a pair of diving goggles includes a pair of rings provided at a slope across one half of the strap and incorporated therewith. The rings receive an aspiration pipe with the effect that the aspiration pipe is secured to stand at right angles with respect to the water level when the diver watches beneath him.