By using ahigh perfomance continuous steel wise through every rowZ Col creates a better supportve surface. Compared with standard spring coil shape, the continuous coll design of ZColl can provide more covering surface, So increaing support for body and ensuring the omamentation of mattress in proper position. Consistent firmness and support help minimize interference between sloep partners. Continuous no-twist system ensures that noiseless movement is achieved., Stress relieved and durability tested to maintain its shape and last longer.