Per instruction, I used the white pads at night, and was astonished to find the pads turn black the next morning. They were simple to put on my feet. When I got out of bed in the morning, I did feel better. I usually wake up stiff, but after using the pads, I was able to get out of bed without feeling stiff. I am already a regular customer of Nuubu, I always keep a stash. In my opinion, they do work!