A protection equipment comprising a base member (2；102) with a deformable membrane (3) which comprises a central orifice (OC) with an adaptive size, configured to selectively circumvent in a substantially airtight manner the neck of the user (U), a hood (104) coupled in a substantially airtight manner the base member, whereby a substantially closed volume (CV) is provided, the closed volume being delimited by the deformable membrane, the base member, the neck and the hood, and an aperture control device (6) to change the central orifice (OC) of the deformable membrane from a large aperture state to a small aperture state.
