Unlike other inserts, Flatliners are specifically made thin enough to use in women’s flats. You never have to say, "my feet smell"; again thanks to these little activated carbon helpers. They can be placed in already stinky shoes or in new pairs as a preventative measure against stinky shoes, extending the life of your favorite around-town shoes, heels, flats, and everything in between. Flatliners have self-adhesive strips so you can simply peel and stick. • Measures: 7 x 2.9 x .04" • 1 pair