***Please measure your chest directly under the breast:
X-Small 59-68 cm (23.2-26.8 inches),
Small 69-78 cm (27.2-30.7 inches),
Medium 79-88 cm (31.1-34.6 inches),
Large 89-99 cm (35-39 inches),
X-Large 100-106 cm (39.4-41.7 inches).
This corrector works by gently pulling the shoulders backwards, and by doing so, it helps correct rounded shoulders and facilitates correct posture.
It does not restrict your movements or breathing in any way, and does not prevent the activity of your own muscles.