Inclusion Criteria:  Informed Consent as documented by signature (Appendix Informed Consent Form) ≥18 years old Diagnosis of Parkinson's Disease according to the United Kingdom Brain Bank Criteria Bilateral STN-DBS for at least 6 months Moderate to severe FOG i.e. FOG-AC ≥8 pts.  Exclusion Criteria:  Known or suspected non-compliance, drug or alcohol abuse, Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, etc. of the participant, Participation in another study with investigational drug within the 30 days preceding and during the present study, Previous enrolment into the current study, Pregnancy Enrolment of the investigator, his/her family members, employees and other dependent persons, L-Dopa induced-freezing (defined by medical history), DBS-induced freezing (defined by medical history), Clinically relevant depression Clinically relevant cognitive impairments Shoe size greater than 46