So I've been skeptical on odor products for shoes but I saw these on Amazon and decided to buy them and to my surprise they work amazing leave them in the Sun for about 2 hours and a half from in my shoes for about 4 or 5 and it gets rid of the smell it really really works I mean the first time I tried it it just phone works instantly I do use these about every single four days maybe 3 days depending on how bad what if it gets waterlogged my shoes or other crap goes on but this is definitely a product I'm recommending to my friends and family.