Here's what other sites are saying:
This Tectron(R) spray treatment deodorizes and refreshes boots and shoes to leave them smelling fresh and clean. Odor-controlling formula is also effective on backpacks, sleeping bags or any gear where moisture and perspiration persist. Just spray directly into footwear or gear and allow to air dry. Use regularly as needed; do not use on outside of shoes. Product contains isopropyl alcohol.