This bracelet is a fixed length and can't be adjusted. If you prefer a looser fit, we recommend sizing up. S:Outer Dimension: 42mm (H), 3.2mm (W) Internal Diameter: 55mm Opening Gap: 27mm Fits wrist up to 155mm Weight 8.9g M:Outer Dimension: 47mm (H), 3.2mm (W) Internal Diameter: 60mm Opening Gap: 31mm Fits wrist up to 175mm Weight 9.6g Product Code: GM-S-B7-NS