The SCOTT Commander series is specifically designed to accommodate SCOTT neck braces in order to maximized comfort and protection. All other SCOTT protectors can also be worn with SCOTT neck braces. In general cases a SCOTT neck brace can be worn over a chest protector as long as it sits correctly on the shoulder, chest and the thoracic member areas. Referring to the User Manuals, the best placement of the thoracic strut is directly up against the body, i.e. under the chest protector. Keep in mind the purpose of the thoracic strut is to prevent rotation of the brace.