The "Gillette Blades 4S Fusion Proglide" refers to a pack of four replacement blade cartridges for the Gillette Fusion ProGlide razor system. This product represents an advanced version of Gillette's popular Fusion line, designed for a closer and more comfortable shave.

Here's a breakdown of the key features of these blades:

Five Anti-Friction Blades: ProGlide blades feature Gillette's "thinnest and finest blades" with an advanced, low-resistance coating. This design is intended to reduce the feeling of tugging and pulling, making the shave feel smoother and more effortless.

Enhanced Lubrastrip: The lubrication strip on these blades is upgraded from the standard Fusion line. It contains more lubricants and a touch of mineral oil, which creates a gel-like layer to help the razor glide over the skin, enhancing comfort and protecting against irritation. The strip fades from green to white as an indicator that a blade change is needed.

Precision Trimmer: A single-blade trimmer is located on the back of the cartridge. This is a very useful feature for precise styling, such as shaping sideburns or facial hair, and for reaching difficult areas like under the nose.

MicroComb and Blade Stabilizer: The ProGlide cartridge includes a "MicroComb" that helps guide hairs into the blades, making the shave more efficient. A "Blade Stabilizer" is also integrated to maintain optimal blade spacing, which is meant to enhance comfort.

Compatibility: All Fusion ProGlide blade refills are designed to be cross-compatible with all Gillette Fusion, Fusion5, and Fusion ProGlide handles. This allows you to use these advanced blades with any compatible handle you may already own.

Packaging: The "4S" in the name simply denotes the pack size, indicating that you are getting four blade cartridges. This is a common and convenient pack size that offers a good balance between cost and having a supply of refills on hand.