Hello friends, I use a Schick Xtreme Cartridge for my head shaves, I normally use the sensitive (green) and have had fantastic results. I bought the Schick Xtreme Ultimate glide (navy blue) and have found them to be extremely mild. Do you think there is a difference in efficiency or is it just simply the glide strip that is different? The green cartridges take less passes and the navy blue seem to be forgiving. Thoughts? Happy shaving! Kerry
