The silicon is super soft, which makes it very comfortable
Have had plantar fasciitis for 6 months; this product is effective in i) reducing the heel pain from the heel strike when walking and ii) keeping my heel from slipping in the shoe (which is a frequent cause of /contributor to plantar fasciitis).  I have seen an immediate improvement.  The silicon is super soft, which makes it very comfortable, but it is a little more delicate than the super stiff rubber heel cups, so you do have to be careful not to rip the silicon when putting the heel cup on and off.
Rating: 5 stars