3M ™ 7500 series reusable half masks have set a new standard in comfort. The patented exhalation valve provides increased durability and is easy to keep clean. Reduced breathing resistance helps to minimize heat build-up in the mask and increases your comfort. Available in three sizes, all masks have the 3M™ bayonet attachment system offering a broad range of twin lightweight filters to protect against gases, vapours and particulates depending on your individual needs and can also be used with 3M supplied air system.