יורה דעה שפ״בYoreh De'ah 382

Se’if 1א׳

(אָבֵל) אָסוּר בִּנְעִילַת הַסַנְדָּל, דַּוְקָא שֶׁל עוֹר; אֲבָל בְּאַנְפִּלְיָא שֶׁל בֶּגֶד אוֹ שֶׁל גֻמִּי אוֹ שֶׁל שֵׂעָר אוֹ שֶׁל עֵץ, מֻתָּר, שֶׁאֵין מִנְעָל אֶלָא שֶׁל עוֹר. וְאִם הוּא שֶׁל עֵץ וּמְחֻפֶּה עוֹר, אָסוּר.

A mourner is forbidden to put on sandals [or shoes]1M.K. 15b, derived from God’s command to Ezekiel, ‘And put thy shoes upon thy feet’ (Ez. XXIV, 17), whence we infer that for everyone else this is forbidden. only if [they are made] of leather, but a pair of shoes made of cloth,2Or felt. reeds, hair or wood, is permissible,3Rubber is also permissible — A.H. for an [ordinary] shoe is [usually made] of leather.4Derived from Yom Kippur where the same prohibition applies. Yoma 78b; O.Ḥ. § 614. Thus T.H. Although the mourner is forbidden to wear shoes, nevertheless, he may recite the morning benediction, ‘Blessed art Thou … who hast provided for all my needs’ (v. Siddur Morning Benedictions) — R.E.Z. Margolis (Laws of Mourning). However, if it [was made] of wood and covered over by leather, it is forbidden.

Se’if 2ב׳

חַיָּה מֻתֶּרֶת לִנְעֹל כָּל ל' יוֹם, מִפְּנֵי שֶׁהַצִּנָּה קָשָׁה לָהּ.

A woman after confinement5Likewise, one who is sick (although not dangerously ill — A.H.), or one who has a wound on his foot (O.Ḥ. § 614, 3) — ShaK. So too, a pregnant woman, if she fears the cold — A.H. is permitted to wear [leather-] shoes throughout the thirty days [of mourning] because the cold is harmful to her.6T.H., derived from Yom Kippur where the same ruling applies. Mishna, Yoma VIII, I and Gemara ibid. 78b.

Se’if 3ג׳

כָּל אָדָם מֻתָּר לִנְעֹל בְּמָקוֹם שֶׁיֵּשׁ סַכָּנַת עַקְרָב.

Every person [in mourning] is permitted to put on shoes where there is danger of [being attacked by] a scorpion.7T.H., derived from Yoma 78b. According to Mord. M.K. III end, where one must appear before a ruler during mourning and must wear shoes, the custom is to put some earth into the shoes. Hence, it follows that the same procedure should be adopted in the present ruling regarding danger, or in all cases where the mourner is obliged to wear shoes — TaZ.