This is for 4-pairs of unisex coated black foam inserts which are new in plastic packaging. They have two layers and are 1/8" thick and compress to 1/16" so they do not raise you up so far as to make your shoe uncomfortable or risk turning your ankle. They are designed to be an addition to your existing insole. They can easily be cut down to the size needed just use the guide lines as they will fit any size shoe up to size 12 men's and size 15 ladies. You can cut them down to fit kids shoes too! They mold to your feet, are durable and provide excellent cushioning and shock-absorption. Ok to use when walking, running or playing sports. They enhance blood circulation and reduce muscular aches and pains. These can be used in sneakers, shoes, high heels, boots... Also, there is no adhesive, the foam will compress to the shape of your feet and stay in place. They can easily be moved from shoe to shoe but it is much easier just to have a pair in every shoe. It is best to put it under the original shoe insert but you can also put it on top of the existing insert with the cloth side up and the coated black foam side down or you can even put in two foam inserts. They are inexpensive (about $2 a pair) and disposable which is best for hygiene. They usually last for months but it depends on the activity and how often worn. Much like the wear and tear on sneakers. Made here locally by our main US supplier.