Conforms to EN 812 A1. The unique angled adjuster designed to fit under the occipital bone at the rear of the skull means that one size really does fit all, particularly when combined with the castellated protective liner. The liner is removable, therefore the cap part is machine-washable for hygiene purposes. It has a Terry towelling sweatband for added comfort and all colour-ways have subtle reflective piping for added visibility safety.