Every pair of shoes I have received from Therafit has come with a black reusable bag with the Therafit logo and a pamphlet explaining all about the PCS System.
About the patented Personalized Comfort System:
PCS is an adjustable resistance control feature in the shoe's shock-absorbing wedge. This patented feature uses three designed dual-density adapters that can be removed to change the shoe's impact resistance and cushioning. By removing one or all three of the personal Comfort Adapters you change the resistance thus making the shoe a lot more comfortable on your tired feet.