[If] she performed chalitzah with a sandal that was not his, or with a wooden sandal, or with a left shoe [placed] on his right [foot], her chalitzah is valid. [If] she performed chalitzah with a [sandal] which was [too] large [for him, but] in which he could [still] walk, or with a [sandal] which was [too] small [for him, but] which covered most of his foot, her chalitzah is valid. [If] she performed chalitzah at night, her chalitzah is valid; but R' Eliezer invalidates [it]. On the left [foot], her chalitzah is not valid; but R' Eliezer validates [it].