What’s the difference between a Gillette Mach3 razor and a Gillette Fusion5 razor?

The Gillette Mach3 has 3 blades progressively positioned to cut hair gradually closer, so for every stroke you take, it takes 3. However, the 5-blade Shaving Surface Technology of Fusion5 has progressive blade geometry and a Flexible Comfort Guard for a comfortable shave.

What are Microfins, and what do they do?

Microfins precede the blades and smooth out the skin before the first blade cuts the first hair. So you get a close, comfortable shave.

What does a Lubrastrip do?

A Lubrastrip is a thin strip that sits at the top of the razor, releasing lubricants while you shave, to produce a great glide. When you are no longer getting an optimal shave, the Lubrastrip fades to white, indicating that it might be time to change the blade.