Reflection phenomena of coupled longitudinal/transverse waves from the stress-free boundary surface of a microstretch elastic solid half-space containing voids have been investigated. Stress-free boundary surface provided a restriction on the cross-coupling parameter between curvature tensor and voids. Using appropriate boundary conditions and Snell’s law, the formulae corresponding to various reflection coefficients and their corresponding energy ratios have been obtained. Numerical computations have been carried out for a specific model and the variation of all the reflection coefficients and corresponding energy ratios is depicted graphically against the angle of incidence. Some special cases have been reduced from the present model and discussed.