This is a Leatt youth neckvest fusion 2.0 in orange, it is an all in one covering neck, chest, back, flank and shoulder protection.
To find your size you will need to measure the chest circumference. Conversion are as follows:
Small/Medium = 54-66cm / 21"-25.5"
Large/X Large = 66-74cm / 25.5"-29.5"
XX Large = 74-86cm / 29.5"-34"
This neckvest features:
New lightweight and flexible product design for better fit and comfort 3DF AirFit ventilated soft impact foam Number plate clip-in function CE tested and certified as Personal Protective Equipment 89/686/EEC CE tested and certified as impact protection: Chest prEN1621-3 Level 1 Back EN1621-2 Level 1 Shoulder EN1621-1 Flank protection Engineered fracture point on rear thoracic strut designed to snap off in an emergency Collarbone cut-out helps to protect your most fragile bones Neck brace structure made of fiberglass reinforced polyamide resin Easy-to-use, no-tool, sizing adjustments and three-dimensional design for perfect fit