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Radio relics are Mpc-size synchrotron sources located in the outskirts ofsome merging galaxy clusters. Binary-merging systems with favorable orientationmay host two almost symmetric relics, named double radio relics. Double radiorelics are seen preferentially edge-on and, thus, constitute a privilegedsample for statistical studies. Their polarization and Faraday rotationproperties give direct access to the relics origin and magnetic fields. In thispaper, we present a polarization and Rotation Measure (RM) synthesis study offour clusters hosting double radio relics, namely 8C 0212+703, Abell 3365, PLCKG287.0+32.9, previously missing polarization studies, and ZwCl 2341+0000, forwhich conflicting results have been reported. We used 1-2 GHz Karl G. JanskyVery Large Array observations. We also provide an updated compilation of knowndouble radio relics with important observed quantities. We studied theirpolarization and Faraday rotation properties at 1.4 GHz and we searched forcorrelations between fractional polarization and physical resolution, distancefrom the cluster center, and shock Mach number. The weak correlations foundbetween these quantities are well reproduced by state-of-the-artmagneto-hydrodynamical simulations of radio relics, confirming that mergershock waves propagate in a turbulent medium with tangled magnetic fields. Bothexternal and internal Faraday depolarization should play a fundamental role indetermining the polarization properties of radio relics at 1.4 GHz. Althoughthe number of double radio relics with RM information is still low, theirFaraday rotation properties (i.e., rest-frame RM and RM dispersion below 40 radm$^{-2}$ and non-Gaussian RM distribution) can be explained in the scenario inwhich shock waves with Mach numbers larger than 2.5 propagate along the planeof the sky and compress the turbulent intra-cluster medium.

Using the polarization properties of double radio relics to probe the turbulent compression scenario