This papercraft is a life size Steel Helmet, a protective helmet appearing in the first-person shooter survival horror video game S.T.A.L.K.E.R.: Clear Sky of the S.T.A.L.K.E.R. series, the paper model is created by XDiem.
You can download this paper model template here: S.T.A.L.K.E.R. - Life Size Steel Helmet Papercraft Free Download [Box] [Gavitex]