Just after the Church updated their dress and grooming guidelines for missionaries, allowing them to wear conservative sunglasses and wide-brimmed hats to protect against the sun, they made another change: sister missionaries in some areas are now allowed to wear dress slacks.

This new adjustment will help men and women serving in the 230 missions impacted by mosquito-born illnesses—such as Dengue Fever, Chikungunya, and Zika—to better protect against infection.

“We are encouraging and training our missionary force to implement these preventative measures and would also encourage the general membership to consider these measures for themselves and their families,” Elder Gregory A. Schwitzer, assistant executive director in the Missionary Department and the chairman of the Missionary Medical Health Services Division, said on Mormon Newsroom.

Read even more details at LDS Living.