He is nonetheless permitted to seek shade beneath a roof or under trees, or to sit in the shade of a tent and the like, and this is unanimously agreed upon.
As for taking shade inside a maḥmil—such as the maḥārah (1) that has a domed cover while the caravan is moving—scholars have differed about this (2).
What is preferable for the person in iḥrām is to stay exposed to the sun for the sake of the One for Whom he entered iḥrām, just as the Prophet—peace and blessings be upon him—and his Companions used to perform the pilgrimage. Ibn ʿUmar once saw a man over whom a shade had been erected and said, “O pilgrim in iḥrām, expose yourself (3) to the One for Whom you have entered iḥrām” (4).
For this reason the early generations disliked the domed coverings placed upon litters—the mahāmil that have a roof—whereas the uncovered litters were regarded as objectionable only by a few ascetics.