These shoes are soft and comfortable. unfortunately one shoe is larger than the other although they have the same size listed on the bottom. normally wear size and ordered size , & the smaller shoe fits well enough, but the larger shoe is too big.Colloidal dispersions suspensions, emulsions, and foams [ian . morrison, sydney ross] on amazon. *free* shipping on qualifying offers. from the basics to the most recent developments concise reviewof suspensions, emulsions, and foams updating and expanding their highly popular colloidal systemsand interfaces Memory foam consists mainly of polyurethane as well as additional chemicals increasing its viscosity and density.it is often referred to as “viscoelastic” polyurethane foam, or