Half mask made of very flexible silicone. reusable, it contains two side filters that provide less breathing resistance. easy maintenance. with head harness designed to offer an optimal fit and good stability. its design allows the mask to be hanged comfortably from the neck for moments when protection is not required. compatible with climax 755 and 756 filters for gases, vapors, particles and combined filters. filter connection: thread filters: 755/756 material: silicone nominal protection factor (fp) standard: en 140:1998