Personal Safety Equipment The lightweight masks use new materials and the new design provides for a uniquely comfortable face-seal. An X-guided strap ensures an even distribution of the mask against the face giving the wearer extra comfort, without unwanted pressure on the face or pulling of the hair. The X-plore half masks are available in both reusable and limited use styles. Three different sizes ensure that each user will find a mask to provide a safe and comfortable facial seal. The Draeger X-plore series include the 3300, 3500 and the 5500.