Features: Its easy to wear design ensures quick installation and stable shooting, reducing unwanteds shaking. Widened elastics bands,comfortable and breathable.Easily adjust to fit to wide body size. Soft linings, lightweight and breathable, with no compression when worn, can be freely disassembled for cleanings; Suitable for Action4/3,X4 Camera; Chest harness for mounting any quick release camera at chest level Specifications: Component:PC+ABS+Elastic Bands for Action4/3,X4 Camera; Size:Approx.20-80cm/7.87-31.49inch,30-90cm/11.81-35.43inch; Package Includes: 1pc Chest Mount Harness 1pc Screw Rod 1pc 1/4Adapter 1pc Quick Release Upper Cover 1pc Manual note: Please allow 1-2cm errors due to manual measurement,please make sure that you donot mind befores you order. Due to the differences between different monitors, the picture may not reflect the actual item color.