A trampoline protective rim covers springs and frame and dampens any fall. This is very important to be able to jump safely.
You want to prevent your children from touching the frame or the springs at all times while jumping.
This edge is suitable for a trampoline of 360-366 cm (12 ft) with a maximum spring length of 17.5 cm. If your trampoline has longer springs look at an Etan Premium protection rim.