Designed for use with HS80 and HS84 series, the Philips Norelco HS85 Cool Skin Replacement Head provides a comfortable electric shave, wet or dry. The Super Lift and Cut dual-blade action lifts hair to cut comfortably close below skin level. The Flex Tracker system and glide rings automatically track along the contours of your face, preventing irritation to your skin and keeping your face smooth. Super Lift and Cut Technology Provides a Close Shave These replacement heads are equipped with the Patented Super Lift and Cut System, which is designed to give you a clean shave for any hair length. The first blade lifts while the second blade cuts for a comfortable, close shave. Flex Tracker System Protects Against Skin Irritation The Flex Tracker automatically tracks the curves of your face and helps to protect against skin irritation. Glide Rings The shaving heads have unique glide rings to help the shaver move smoothly over your face. Comfortably Shaves Wet or Dry Shaving in the shower saves time and gives you the fresh sensation of wet shaving. Replace Every Year for Best Results - Easy Click Off, Click On Replace the shaving head every year to keep your shaves close and comfortable. The HS85 head easily clicks on and off the unit for simple replacement. 1. Switch off the razor and disconnect it from the power outlet. 2. Remove shaving head from razor by pulling it straight up from razor. 3. Place new shaving head back on the razor and push down until you hear a click.