When used on the ground frame they prevent goal nets from fraying along the base as with all other types of clips that pull the net under the post and into contact with  the ground. Superior  than clips and velcro ties for fixing nets to goal posts.

This goal post net tie is manufactured by ITSA GOAL.  

The net tie is removable from the goal post, The video demonstrates the tie is firstly wrapped to the netting cord and then the tie is wrapped and attached to the goal frame.

This allows the net to be removed after the game and the ties can be left in place on the net for the next game.