Es Footwear (pronounced like the letter E S) is an American footwear brand started in 1995 Es was developed as a more technically-oriented shoe line compared to other brands at the time, in both aesthetic and function. The Theory 1.5 pushes the legacy of the Theory ever forward with a new re designed midtop with a removable strap, a hidden stash pocket and a comfortable fit. The results are in, this Theory is proven.