The tzit zit is not the prayer shawl, it is the tassels on the corners.
Actually they are knotted fringes at are attached to the four corners of a tallit, which is a garment worn by Jewish men under their shirt usually. They are made of white and blue threads. Each knot represents a commandment from God. They are for a reminder to remember God's laws throughout the day.
Deu 22:11 `Thou dost not put on a mixed cloth, wool and linen together.
Deu 22:12 `Fringes thou dost make to thee on the four skirts of thy covering with which thou dost cover thyself .
Num 15:38 `Speak unto the sons of Israel, and thou hast said unto them, and they have made for themselves fringes on the skirts of their garments, to their generations, and they have put on the fringe of the skirt a ribbon of blue,
Num 15:39 and it hath been to you for a fringe, and ye have seen it, and have remembered all the commands of Yehovah, and have done them, and ye search not after your heart, and after your eyes, after which ye are going a-whoring;
Num 15:40 so that ye remember and have done all My commands, and ye have been holy to your God;