Tallit Katan with Tzitzit, made of 100% cotton, made by Talitania company with a Kashrut tag. meets the highest standards of kashrut.
The mitzvah to wear a Tzitzit applies only to 4 cornered garments. In biblical times, most clothing were made of a four-cornered rectangle of cloth, direct from the loom, which was fastened around the body. In modern times, people wear tailored clothing which often does not consist of 4 corners. So a special 4-cornered cloth called a Tallit, which is somewhat like a shawl, is worn by those who want to fulfill the commandment to wear Tzitzit. The only religious mission of the Tallit is to hold the Tzitzit on its 4 corners.