If you are looking to add some cush to an uncomfortable shoe the Ortholite insoles are great at adding comfort. They do take up space and will make your shoe tighter fitting which may be great for a sloppy shoe. They do not add arch support. My wife and I have used all three thicknesses and this allows one to customize to a shoe's volume. I would love to see Merrell sell their iMove insoles found in their more supportive shoes.