Multi-Layer Protection Architecture and Material Assimilation Multi-layer protection where DJDUCK safety wallet cover combines external covering (polycarbonate or TPU thermoplastic with Coast firmness 85-95A providing rigid structure), internal shock-absorbing layer (thermoplastic elastomer or silicone with Coast hardness 40-60A dissipating influence energy via compression), and wallet part (natural leather or PU leather 0.6-1.8 mm density bonded …