What protective measure should be taken for the client's comfort during waxing?

Using a client drape or towel is an important protective measure that enhances the comfort of the client during a waxing procedure. Draping the client appropriately serves multiple purposes: it helps maintain their modesty and provides a layer of protection for their clothing, ensuring they are not exposed to wax materials or any residue that may be difficult to clean. Moreover, it helps create a more comforting and professional environment, which can help the client feel at ease during the procedure.

The other options may address different aspects of the waxing process but do not focus on the protective comfort of the client in the same manner. While applying lotion might provide skin protection, it usually isn't suitable immediately before waxing as it may affect wax adhesion. Keeping the room temperature low could lead to discomfort, particularly if a client feels chilled while undraped or partially covered. Using cold wax may not be comfortable for all clients, as warmer wax can provide a more soothing experience. Thus, draping is the most directly relevant and protective measure for client comfort.