Reference for Yevamot 204:21
תניא כוותיה דרבא חלצה במנעל הנפרם שחופה את רוב הרגל בסנדל הנפחת שמקבל את רוב הרגל בסנדל של שעם ושל סיב בקב הקיטע במוק בסמיכת הרגלים באנפיליא של עור והחולצת מן הגדול
Consequently<span class="x" onmousemove="('comment',' Lit., 'but not'? ');"><sup>68</sup></span> it must be inferred that one statement refers to a leather sock and the other to a felt sock. This proves It. It was taught in agreement with Raba:<span class="x" onmousemove="('comment',' That a difference is drawn between a sock of felt or cloth and one of leather. While the former is not regarded as a shoe the latter is. ');"><sup>69</sup></span> [If a sister-in-law] performed <i>halizah</i> with a torn shoe which covered the greater part of the [levir's] foot, with a broken sandal which contained the greater part of his foot, with a sandal of cork<span class="x" onmousemove="('comment',' Or, according to others, 'bamboo'. ');"><sup>70</sup></span> or of bast, with an artificial foot,<span class="x" onmousemove="('comment',' Of the levir. Lit., 'the hollowed stump of the cripple'. ');"><sup>71</sup></span> with a felt sock, with a support of the feet,<span class="x" onmousemove="('comment',' One of the cushions which a cripple ties to his feet. ');"><sup>72</sup></span> or with a leather sock, and also where she performed <i>halizah</i> with an adult