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Made from soft polycotton, the back of the HB10 has a metal adjuster so that it can be quickly adjusted to fit. The cap is sewn in six sections with contrasting trim and a shaped back which provides ventilation for the wearer. Cooling mesh fabric for increased breathability. Reflective trim for increased visibility and safety. Adjustable strap fastening for flexible sizing. Air vents for extra breathability. Does NOT meet EN ISO 20471.