Abstract: A heel protective adjustable shoelace, applied to an adjustable strap-type swimming fin, includes a heel pad, a heel protecting portion and two connecting adjusting straps. The heel protecting portion integrally extends along the longitudinal direction of the heel pad, and together with the heel pad define an accommodating space for accommodating and enveloping a heel and a wearing opening in communication with the accommodating space. The two connecting adjusting straps integrally extend from two opposite sides of the heel protecting portion corresponding to the wearing opening, respectively, to connect to a webbed member. A connection between the heel protective adjustable shoelace and the webbed member may be adjusted through the two connecting adjusting straps to match a foot length of a wearer. Further, a heel of a wearer is prevented from being cut by an external object such as corals and reefs during a scuba diving activity.

Abstract: A heel protective adjustable shoelace, applied to an adjustable strap-type swimming fin, includes a heel pad, a heel protecting portion and two connecting adjusting straps. The heel protecting portion integrally extends along the longitudinal direction of the heel pad, and together with the heel pad define an accommodating space for accommodating and enveloping a heel and a wearing opening in communication with the accommodating space. The two connecting adjusting straps integrally extend from two opposite sides of the heel protecting portion corresponding to the wearing opening, respectively, to connect to a webbed member. A connection between the heel protective adjustable shoelace and the webbed member may be adjusted through the two connecting adjusting straps to match a foot length of a wearer. Further, a heel of a wearer is prevented from being cut by an external object such as corals and reefs during a scuba diving activity.

Abstract: A safety diving backpack, specifically a one-piece, detachable diving backpack, that may serve to dispose water-resistant handlights, life buoys, kettles and spin reel, complete with wires or ropes in the hollow cylinder and in the spaces as provided on both sides and on the underside thereof respectively. The linkage as provided by such wire-ropes to fellow divers allows divers to ask for help from such fellow divers in case of an emergency that befalls a diver equipped accordingly. In addition, by virtue of the striking marks and alarm signals of the headlights and life buoys released at the outbreak of fatal tides or other dangerous situations to the diver, the rescue teams can detect them in time so as to give necessary help to the endangered diver.

Abstract: A sports net and frame includes inner frame members, a substantially rectangular outer frame and a netting material. The inner frame is characterized by at least two adjusting rods, each rod being attached by spring elements in a spaced relationship to a side of the netting material and substantially perpendicular to each other. The outer frame is attached by spring elements to at least two perpendicular sides of the netting material. Adjustable screws attach each adjusting rod to the outer frame whereby adjustment of the screws results in adjusting the tension in the netting material. The outer frame is further provided with elements for attaching a sports net and frame of identical structure.