Open coil spring assemblies

An open coil spring assembly, comprising:

• a plurality of rows of open coil springs arranged in a matrix, each of the open coil springs including an upper end convolution, a lower end convolution, and a plurality of helical convolutions that extend between the upper end convolution and the lower end convolution;
• and
• upper lacings extending between the plurality of rows,
• wherein for each of the open coil springs, at least one upper lacing connects the open coil spring to an open coil spring of an adjacent row.