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During their lifetime, galaxy clusters grow through the accretion of matterfrom the filaments of the large scale structure and from mergers with otherclusters. These mergers release a large amount of energy into the intraclustermedium (ICM) through merger shocks and turbulence. These phenomena areassociated with the formation of radio sources known as radio relics and radiohalos, respectively. Radio relics and halos are unique proxies to study thecomplex properties of these dynamically active regions of clusters and ingeneral the micro physics of the ICM. Abell 3667 is a spectacular examples of amerging system hosting a large pair of radio relics. Due to its proximity(z=0.0553) and large mass, the system enables the study of these sources to auniquely high level of detail. We observed Abell 3667 with MeerKAT as part ofthe MeerKAT Galaxy Cluster Legacy Survey. We used these data to study the largescale emission of the cluster, including its polarisation and spectralproperties. We present the most detailed view of the radio relic system inAbell 3667 to date, with a resolution reaching 3 kpc. The relics are filledwith a network of filaments with different spectral and polarisation propertiesthat are likely associated with multiple regions of particle acceleration andlocal enhancements of the magnetic field. Conversely, the magnetic field in thespace between filaments has strengths close to that expected in unperturbedregions at the same cluster-centric distance. Comparisons with MHD simulationssupports the idea of filaments as multiple acceleration sites. Our observationsalso confirm the presence of an elongated radio halo, developed in the wake ofthe bullet-like sub-cluster that merged from the South-East. Finally, weassociate the process of magnetic draping to a thin polarised radio sourcesurrounding the remnant of the bullet's cool core.

MeerKAT view of the diffuse radio sources in Abell 3667 and their interactions with the thermal plasma