As other people before me stated, the plasters are really good for quick fixes or even applied before some heavy walking where you expect bruising to happen. They form a soft cushion that protects the wounded area and you honestly cannot feel anything for it. My boyfriend had these on the palms of his hands while biking and worked just as well; Five stars till now.
-1 because they don't always stick, I wore flats and it came off in less than 3 minutes on both feet. Some other time I forgot to take it off before a shower and it stuck there for ages. Hit and miss I guess.
-1 because when they come off, boy, they came off with my bruised skin to reveal the wound too! Not nice.