Silicone provides a more comfortable ft and soft feel to the face. Available with an optional speaking diaphragm for improved communication. Dual sealing flange, with 1 inner and 1 outer flange, provides excellent facepiece seal and a more secure fit. Rear split strap for easy donning and better support with retainer clips to hold excess straps in place. Continuous Flow SAR adapter kit available. Available in three sizes for wide range of fit.