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#Leather garments are exempt from the obligation of tzitzit, even on a rabbinic level.<ref>Gemara Menachot 40b. Shulchan Aruch 10:4</ref>
#Along the same lines, some poskim equate leather with synthetic materials (such as polyester, nylon, and rayon) and maintain that they are also exempt from tzitzit.<ref>Rav Moshe Feinstein in Igres Moshe 2:1</ref> Others differentiate between woven synthetic materials, which should be treated like cotton, and non woven synthetic materials, which should be treated like leather.<ref>Rav Tzvi Pesach Frank in Har Tzvi 1, 9</ref> Therefore, it is best not to use synthetic materials for the mitzvah, but if one does he should refrain from making a bracha on it.<ref>Tzitz Eliezer 12:3; Ohr LeZion 2:3</ref>
 
== Size Requirements ==
#There are various opinions<ref>This range emanates from the Gemara Menachot 40b dictate that the garment needs to be the size that it would cover the head and majority of a minor. First off, there are different interpretations as to how old this minor is: The Chinuch (Shelach: 386) and Bach (16) say the reference is to a 6 or 7 year old, the Tur (16) says 9 years old, and the Radbaz (6, 2:106) explains it to be a 5 year old. Second of all, there is ambiguity if the majority requirement means that the garment needs to cover the head and then in addition a majority of the kid’s body (Radbaz) or if it only needs to cover in total a majority of the kid with the head included (Chinuch). Meaning, it would be sufficient to cover the kid’s head and another 30 or 40% of his body, as opposed to 51%</ref> as to how big the garment needs to be to qualify as a halachically bona fide garment, so that one could make a bracha on them without worrying if it is a bracha levatala (in vein or wasted blessing): 1 amah by 1 amah<ref>Pri HaAretz 1; Beit David 8; Shalmei Tzibur 26b; Pri Ha’Adoma 23a; Nachal Eshkol pg. 102:4 ; Ha’Elef Lecha Shelomo 1:4.</ref>, 1.5 amot by 1 amah<ref>Chazon Ish 3:31; Rav Pe’alim 2:6; Mishna berura 16:4;</ref> , 1.5 amot by 1.5 amot<ref>Lev Chaim 1:99; </ref>, 2 amot by 1 amah<ref>Siddur of Rabbi Shneur Zalman, the author of Shulchan Aruch HaRav and The Tanya. Similarly, the Gra, without specific numbers, was very strict in this regard and required the garment extend down to one’s knees. Also, the Chazon Ish (ibid) concludes that it is best to follow this size requirement. Likewise, the Mishna Berura (8:17, 16:4) suggests this size to avoid difference of opinions.</ref>, and finally there is even an opinion that there is no size requirement at all.<ref>Aruch HaShulchan 16:5</ref>
2. Additionally, there are two different opinions for the conversion of one amah, or 6 tefachim (fists), to modern measurements: Rav Chaim Na’eh holds it is 48 cm or 18.9 inches, while the Chazon Ish holds it is 57.7 cm or 22.7 inches.
3. Additionally, there is a dispute if the dimensions include or exclude the center hole for one’s head and neck .
 
== Making Tzitzit==

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