Therafin Therafit - Stretch Chest Strap (2 Buckles with Adjustable Straps) has two buckles with adjustable straps. (2 metal clips and 3 bar slides). Buckles are reinforced and both have a covering to aid in comfort under the arm. TheraFit Chest Strap padded area dimensions are: SM (3" x 16"), MED (4" x 20"), LG (4" x 24"). Length: SM (46"), MED (54"), LG (64").