The SlimTech is another great insert with arch support made by the PowerStep people but it's only 3/4 length, not full length. The 3/4 length will help it fit better in some shoes. Unlike the other PowerSteps, you would not normally try to remove the existing insole to use the SlimTech.
See also thinner PowerStep Insole® for
See Super Cushion Insole® for best cushioning w/o arch support.