Patent ID: 7396574

Claim:
A shoe cushion comprised of at least one chamber comprised of a barrier material, said cushion having a thickness of at least 0.400 inches, said barrier material comprised of an elastomer, said elastomer being at least semi-permeable to at least a first reactant compound, at least a second reactant compound disposed within said at least one chamber, wherein said first reactant compound and said second reactant compound interact to form a resultant gaseous compound selected from O 2 , N 2 , and CO 2 at least partially inflating the cushion, wherein said at least one chamber is pressurized to greater than about 14.7 psi. gauge pressure by said resultant gaseous compound, and wherein a rate of diffusion of said resultant gaseous compound through said barrier material is less than a rate of diffusion of said first reactant compound through said barrier material.