Wool tallit katan with patented design to prevent fraying at the neck opening.
100% wool. Made in Israel by Mishkan Hatchelet.
For halachic reasons, Sephardic Jews generally wear wool rather than cotton*, and the prevalent custom is to have white striping.

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* According to the Shulchan Aruch, only wool (and linen) must have tzitzits according to Torah law, which means wearing a tallit katan made of cotton would only be at a Rabbinical level. Many Ashkenazim wear a cotton tallit katan because they rely on the Rema, who disagrees, saying all fabrics require tzitzits according to Torah law. Despite the Rema’s ruling, the Mishnah Berura notes that wool is preferable in any case.