Two characteristics are introduced for eiastomers subjected to uniaxiai tension: Poisson's ratio ~ and the initial modulus Etr. For ten types of rubbers employed in shoes [i], these quantities are constant right up to fracture deformations, it is shown that the shear modulus G, Young's modulus E, and the bulk modulus K of rubbers can be calculated from the known value of Etr and v. The coefficients Etr , v, G, K, and E (which are constant for large elastic (highly elastic) deformations of rubbers) are calculated for deformations of one type uniaxial tension in contrast to the coefficients in linear theories.