Inclusion Criteria:  Have a confirmed diagnosis of MS by a Consultant Neurologist as per Mc Donald Criteria. Have moderate to severe mobility restriction as defined by an Extended Disability Status Scale (EDSS) score of between 6 to 7.5 (inclusive). Meet the anthropometric requirements of the REX device (See 'RAPPER IIIMS 014 TF-04 v 3.0 REX Clinical Assessment Guide A4' for details of weight, height, size and range of motion requirements) Offer written informed consent to take part in the study  Exclusion Criteria:  a history of osteoporosis or osteoporosis related bone fractures. skin integrity issues that could be adversely affected by the REX device severe hypertonia (spasticity) as indicated by a score equal to or greater than 4 on the modified Ashworth scale on any muscle in their lower limbs. a behavioural, cognitive or communication impairment which could interfere with the ability to participate in a rehabilitation programme, as noted during screening (e.g., agitation, inability to follow two step commands) Are unable or unwilling to provide informed consent Are considered medically unsuitable for rehabilitation in the opinion of the screening medical specialist a known allergy (skin contact) to materials used in Rex Are pregnant