To quote their website:
"Inspirational Scripture Shoe Inserts
Designed to aid in the daily prayer, meditation and growth of a strong spiritual relationship with Christ.
In-Souls inserts are designed to provide a tangible support to assist Christians to literally "walk in the word of the Lord." Worn in the right shoe, each one provides a related scripture and affirmation. To enhance the spiritual walk with God, the inserts help one to "stand" on His Word, meditating on it day and night. Inserts may be alternated daily to help cultivate the word of God in your life. Look for other In-Souls sets to cover a variety of topics - from trust, obedience, patience and redemption to marriage, work and body image."
They vaguely remind me of Tefillin or phylacteries, which are the two boxes containing Biblical verses that have black leather straps attached to them to strap them onto the arm or forehead. They are used in rabbinic Jewish prayer, but then removed for the rest of the day.
I suppose this is disturbing to me because the foot was considered (at the time of Christ) as the dirtiest part of the body. It doesn't seem to be a sign of respect.
Again, Christian marketing the leaves me speechless.