A helmet can include an upper body comprising an interior surface comprising a locking flange, and a lower body positioned at least partially inside the upper body. The lower body can comprise an edge in contact with the locking flange of the upper body. At least one joining pin can be located within, and bridge, the lower body and the upper body. An at least one basket pair can comprise an upper basket comprising a pin receiver, the upper basket being at least partially embedded within the upper body. A lower basket can comprise a pin aperture, the lower basket being at least partially embedded within the lower body and positioned such that the pin aperture is aligned with the pin receiver of the basket pair. The at least one joining pin can be positioned inside both the pin aperture and the pin receiver of the basket pair.