Heel grips' fabric is soft and non irritating, do help keep the shoe in place and prevent slipping while walking. They also prevent blisters and rubbing on the back of your heel.
Thickness is good, heel liners keep shoes tight, work great if your shoes are a bit loose; Fit most shoes
Self-adhesive backs, heel cushion have a very strong adhesive, they stay in place when you walk long time
When placing heel inserts or ball-of-foot cushions, be sure the shoe is completely clean and dry and press & hold for several seconds to ensure good adhesion.