The goal of this clinical trial is to demonstrate the improvement of muscular oxygenation in patients with Multiple Sclerosis and spasticity using Exopulse Molli suit stimulation. The main questions it aims to answer are:

• to evaluate the short-term impact of EXOPULSE Molli suit on muscular oxygenation in adult MS patients suffering from spasticity.
• to assess the effects of Exopulse Mollii suit on spasticity, pain, fatigue, quality of life (QoL), walking and risk of fall.

Study subjects will participate in:

• One baseline visit for inclusion in the study during which the patient will undergo the first session (active or sham) along with an evaluation before and after the session
• One visit after two weeks during which the patient will undergo the second session (active or sham) along with an evaluation before and after the session
• One visit two weeks after the second stimulation; where the patients will undergo a fifth evaluation and receive the EXOPULSE Molli Suit for the four-week open label phase to use the suit at home for an active stimulation session every other day for four weeks.
• One visit at the end of the open label phase to perform the sixth and last evaluation and return the EXOPULSE Molli suit.

Researchers will compare both Active and Sham groups to demonstrate the improvement of muscular oxygenation in patients with MS and spasticity using Exopulse Molli.

The study is a randomized crossover, sham-controlled, double-blind trial to demonstrate the improvement of tissue oxygenation and frequent MS symptoms following a single session of "active" versus "sham" Exopulse Mollii suit separated by 2 weeks. A 2-week washout period should be enough to prevent a potential carry over effect. After this phase (phase 1), a second open label phase (phase 2) will be proposed for patients to understand the effects of Exopulse Mollii suit employed for one month (3 sessions per week) on tissue oxygenation and MS related symptoms.

Inclusion Criteria:

• Definite MS diagnosis according to the 2017 McDonald criteria since at least one month.
• Age between 18 and 75 years.
• Ability to walk freely or with the need of support (expanded disability status scale score (EDSS) < 7.5).
• Being free of relapses in the last three months.
• Having spasticity with a score of at least 1+ on the MAS.
• Female patients of child-bearing potential must agree to use adequate birth control measures
• Voluntarily given, fully informed written and signed consent obtained before any study related procedures are conducted

Exclusion Criteria:

• Being included in another research protocol during the study period.
• Inability to undergo medical monitor for the study purposes due to geographical or social reasons.
• Having a cardiac stimulator, a ventriculoperitoneal shunt, an intrathecal baclofen pump or other contraindications to using Exopulse Mollii suit.
• Being pregnant.
• Having a change in their pharmacological therapy in the last three months.
• Suffering from other somatic or neuropsychiatric diagnoses (e.g., arrhythmias, uncontrolled epilepsy, diseases causing osteoarticular and muscular pain).
• Having a body mass index above 35 Kg/m2.
• In case of the introduction of a medical device other than Exopulse Mollii suit during the study period.
• Patients under juridical protection.
• Prisoners.