A helmet comprising: an inner shell (3); a detachable outer shell (2); an intermediate layer (4) between the inner shell and the outer shell, wherein the intermediate layer is formed from or coated with a low friction material against which the outer shell and/or inner shell are configured to slide;a first connecting member (5) connecting one of the inner shell and the outer shell to the intermediate layer, and configured to allow sliding between one of the inner shell and the outer shell and the intermediate layer, when the outer shell is attached to the helmet; and a second connecting member (15) connecting the other of the inner shell and the outer shell to the intermediate layer, and wherein, when the outer shell is attached, the outer shell and the inner shell are configured to slide relative to one another in response to an impact, a sliding interface being provided between the intermediate layer and one or both of the outer shell and the inner shell.
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