This holster is designed for phone with rugged / semi-rugged protective case installed (OtterBox Defender & Commuter, Spigen Tough Armor, i-Blason Armor, Supcase Beetle Pro, Lifeproof, Griffin Survivor, Supcase, Urban Armor, Battery Case, and etc...)
SMALL:
External Dimensions: [6.12 X 3.25 X 1.1 inches]
Inside Dimensions: [5.6" X 3.1" X 0.7 inches]
MEDIUM:
External Dimensions: [6.5 X 3.5 X 1.1 inches]
Inside Dimensions: [6.25" X 3.25" X 0.7 inches]
LARGE:
External Dimensions: [7.0 X 3.75 X 1.1 inches]
Inside Dimensions: [6.75" X3.53" X 0.7 inches]