A great addition to all of your shoes and sandals! I have added these to all of my shoes and they definitely make them all more comfortable. I do a little trial and error, marking with a pencil or chalk, depending on the color/texture of the shoe insole, before attaching them, via the double-stick tape. If the insole material does not want to attach with the tape, I add a small piece of double-stick carpet tape. I too, have started having problems finding them in my local store, so I order several pair on-line to have handy for any new shoe/sandal purchase. Don't waste your money on other brands!!!
I have high arches so these are useful. They stick to the inside of my shoe where I put them. The tricky part is putting them in the right spot. I have successully repositioned them prior to wearing the shoes.
I have bought more to go in more of my shoes.
However, they do not provide enough support for my high arches. They do help. I often use an addtional insole to give sufficient support.
Target.com indicates that these can be found in store. My store usually doesn't carry them.