א מוּכִין, (פי' כָּל דָּבָר רַךְ קָרוּי מוּכִין כְּגוֹן צֶמֶר גֶּפֶן וּתְלִישֵׁי צֶמֶר רַךְ שֶׁל בְּהֵמָה וּגְרִירַת בְּגָדִים בְּלוּיִים), שֶׁטָּמַן בָּהֶם דֶּרֶךְ מִקְרֶה, אָסוּר לְטַלְטְלָן אֶלָּא מְנַעֵר הַכִּסוּי וְהֵן נוֹפְלוֹת; וּכְגוֹן שֶׁמִּקְּצָתָן מְגֻלֶּה, שֶׁאֵין זֶה טִלְטוּל אֶלָּא מִצִּדּוֹ. וְאִם יִחֲדָן לְכָךְ, מֻתָּר לְטַלְטְלָן. אֲבָל אִם טָמַן בְּגִזֵּי צֶמֶר, אֲפִלּוּ לֹא יִחֲדָן לְכָךְ, מֻתָּר לְטַלְטְלָן. וְהָנֵי מִלֵּי סְתָם גִזִּין שֶׁאֵין עוֹמְדִין לִסְחוֹרָה, אֲבָל אִם נְתָנָם לְאוֹצָר לִסְחוֹרָה, צְרִיכִין יִחוּד וְאִם טָמַן בָּהֶם בְּלֹא יִחוּד, מְנַעֵר הַכִּסוּי וְהֵן נוֹפְלוֹת, דְּהַיְנוּ: לוֹמַר שֶׁנּוֹטֵל כִּסוּי הַקְּדֵרָה שֶׁיֵּשׁ תּוֹרַת כְּלִי עָלֶיהָ, וְאַף עַל פִּי שֶׁהֵם עָלֶיהָ לֹא אִכְפַּת לָן, דְּלֹא נַעֲשֵׂית בָּסִיס לָהֶן.
1 Several Laws Governing Insulation and Moving the Insulating Materials, 7 Seifim: Since they are muktzeh, on Shabbos, it is forbidden to move muchin (any soft substance, e.g., cotton, the soft wool of an animal, or the remnants of worn out clothes.” In this section, we are speaking about muchin that are dry, for muchin that are wet are considered as substances that increase temperature and are forbidden to be used for insulation) that were used on Friday to insulate a pot on the spur of the moment. Rather, he should shake the cover and it will fall (on its own) e.g, its muktzah is uncovered, and this is not considered 'moving'. However, if it was insulated with fleece wool, even if it was not designated for that purpose, it is permitted to move it. This refers to fleece that is not set aside for commerce. However if they are for merchandise they must be set aside. If one insulates with them without them being set aside, one shakes the cover and they fall off, that is to say, when the cover of the pot is considered as a k’li. Even though they are on top of it, we are not worried about it, because we do not make a Basis for them.