Explanation #1 (Rashi): Sayadin are vendors of plaster. When they work with plaster, they wear [such a sandal]. It is of wood, because plaster burns leather. My Rebbeyim explained like this.

Explanation #2 (Rashi himself): Sandal of Sayadin is of straw.

Support: It seems that this is correct. A Tosefta teaches that R. Akiva is Metamei a straw sandal.

Question: Why didn't they agree to him? Is it worse than a clump of Se'or (sourdough) that was designated for sitting (it will fill a hole in a seat)? We hold that it is Tamei Midras;

Regarding Midras, we do not require that it is like a Sak. Anything special for Midras (to sit or lie on) receives Tum'as Midras!

Answer #1: According to the version in which Rashi explained that it is of straw, this is fine. Since it does not endure, it is not Tamei, for it is unlike a clump of Se'or, which lasts.

Support: We find like this in Mishnayos. It teaches regarding oak, nut or pomegranate that children carved out to measure earth in them, they receive Tum'ah, whereas regarding a turnip or Esrog that was carved out, it teaches that they do not receive Tum'ah, because they do not last.

Question: According to the version that the sandal is of wood, this is difficult. It is proper to last, since it is of wood!

Answer: Perhaps the reason he is Metaher the sandal is because it is not considered proper to walk in, this that he goes out with it, since it is not normal to make a shoe for walking like this.

Similarly, regarding a tube, since it is not normal to make it from [hollow] reeds, it is not considered a Kli. It is unlike a clump [of Se'or], which is it is common to make [things] for sitting like it.

Question: How is [R. Akiva] Metamei? Since it is not proper for sitting, it is not Metamei Midras;

And regarding Tum'as Mes, in the Parshah are written only Kelim of wood, leather, fabric and Sak!

Answer #1: Also straw is considered of wood, like it says (Brachos 40a) that the fruit that Adam ha'Rishon ate was wheat.

Note: Tosfos did not answer regarding a tube of reeds. Perhaps he asked only about a straw hive, for we can say that reeds are considered wood. Tosfos needed to cite that R. Akiva is Metamei, so he also brought the words in between "u'Shefoferes Shel Kanim." Alternatively, he asked also about a tube of reeds. We answer that even straw is considered wood, so all the more so reeds are considered wood.

Answer #2: This Tum'ah is mid'Rabanan.

Observation: According to the latter Perush of Rashi, that the sandal is of straw, we properly compare a hive to a sandal of plasterers;

According to the other Perush, that the sandal is of wood, we must say that we bring [a comparison] as follows. Just like R. Yochanan is Metaher a straw hive, because it is not normal to make it of straw, similarly regarding a plasterers' shoe. Because it is not normal to make it of wood, he is Metaher.

Question (R. Eliezer of Mitz, to the Rashba): What was the question? At the time of his work, he walks in it. It is made for this!

Answer #1 (Rashba): A sandal of plasterers is not made to wear on the foot. It is one of the Kelim of plasterers;

It is made like a sandal, and he can put his foot in it to wear it. However, it is made only to plaster the house, and sometimes he wears it and walks in it until he gets to his house. This is why [the Gemara] asks "it is not made to walk in it...!"

Answer #2 (Ri): [We ask that] since it is not made at all to wear on the foot, only to guard his shoes, lest they be burned from the plaster, it is not made to walk in it;

Even so, [Rav Acha] answers that a plasterer walks home in it...

Implied question (Rav Pores): Why didn't the Reisha of our Mishnah teach "if there is a receptacle for tufts, it is Tamei Midras", like the Seifa taught?

Answer: This would connote that if it does not have a receptacle, it is Tahor from Midras, but it receives Tum'as Mes, and this is not so, for it is a Pashut Kli Etz (it has no receptacle);

Therefore, he taught Stam Tamei, that in such a case it is Tamei, but if it does not have a receptacle for tufts, it is totally Tahor.

Question: Why does it need a receptacle for tufts? It should suffice that anything that receives Tum'ah Midras, it receives Tum'as Mes!

Answer: The receptacle for tufts makes it proper for Midras.

Explanation #1 (Rashi): This is a wagon that a child sits on it.

Objection: If so, this is obvious! There is nothing more proper for Midras than this!

Explanation #2: It is a wagon that they make for a child to train him to walk. It is Tamei Midras because he leans on it.

Explanation #1: Rashi explained that [Kishurei] are short stilts [for walking through mud].

Question: Rashi asked [why are they not Mekabel Tum'as Midras]?

Answer (Ri): Because they are made only for walking through mud (but not for walking in general), they are not Mekabel Tum'as Midras.

Explanation #2 (Aruch): They are jesters' stilts. They are very tall. They are made only for dancing on them, but not for walking.