| abstract |
The present invention provides a helmet (1) comprising: two layers (2, 3) configured to slide relative to each other; and wherein the surfaces of one or both of the two layers (2, 3) comprise a sliding accelerator (4) , to improve the sliding between the two layers (2, 3), wherein the sliding accelerator (4) comprises (i) organic polymers, polysiloxanes and surfactants; (ii) organic polymers and polysilicon based A copolymer of an oxane and an organic polymer; or (iii) a non-elastomeric cross-linked polymer obtained or obtainable by cross-linking a polysiloxane and an organic polymer. |