My Son wears the magnetic insoles in his work shoes, he was wearing other innersoles prior to this. He was going to the snow and had taken out the insoles in his work shoes and placed them in his snow boots for added comfort. (this means he trusts BioSport) I needed to purchase the additional insoles for his work shoes for replacements and in the meantime had placed his previous insoles in the shoes and told me he was tight in the ham strings and lower back area. Although he still has the lower back pain caused by the tight hamstrings it definitely is reduced and not so frequents since wearing the magnetic insoles. My son is not a gimmick person, we have tried numerous things and spent a large amount of money try to get relief for him. This product he believes is helping him somewhat.