Microcellular (MC) soles based on NR/polyethylene blends were developed as possible replacements for the conventional NR/HSR soles. The mechanical properties of the soles suggest that 80/20 NR/LDPE blends can be used for light weight good quality soles. 80/20 blends of NR/HDPE are also found to be promising base materials for good quality soles. A part of HSR in a NR/HSR blend was replaced by LDPE and the effect of replacement on the mechanical properties was evaluated. It is found that 70/15/15 NR/HSR/LDPE and 60/20/20 NR/HSR/LDPE based MC soles show better mechanical properties than NR/LDPE based MC soles.