Adjustable Springstraps for Tec-Fins / complete Rubberfins like Turtle-Fins, Jetfins, Profins and some others. These Spring-Heel-Straps did have a mentioned advantage:

• The length of the spring is adjustable, so they fit perfect independent the size of your feets, the fins or the boots.
• Easy attachable and reversiebel.
• It is not necessary to alternate or remove anything from your fins.
• The whole spring is covered with a plastic hose, which protects you from getting the springstraps entangled with caveline.