Eclipse

Sometimes we hear coaches panic when their players aren't standing behind the line when making a throw-in.  The laws state that a part of both feet must be on or behind the sideline.  Therefore, no need to panic.  Even if a player has only part of both heels on the line, it is still a good throw-in.

Other aspects of a good throw-in:  a part of both feet touching the ground and the ball must be delivered with both hands from behind and over the head.