The feature of the Gillette Mach3 men's razor blade refills Three DuraComfort blades provide comfort that lasts For a smooth shave, use the Microfin Skin Guard and Lubrication Strip together. For a comfortably close shave, the flexible Comfort Guard with five microfins follows the curves of your face. Improved glide and indication of when to replace the blade are provided by the indicator lubrication strip. Consider the Gillette Mach3 Turbo for a better shave. For a smooth shave, use the Microfin Skin Guard and Lubrication Strip together. For a comfortably close shave, the flexible Comfort Guard with five microfins follows the curves of your face.