Use these to keep the insole of the shoes intact, therefore prolonging their lifespan. Help keep feet dry and odour free for all day comfort. USE: Natural odour control technology uses 100% natural microbes and self-activating enzymes to neutralize odours. Soft top fabric made from recylced materials helps wick away moisture. Algae eva foam layer adds cushioning comfort while its micro-perforations promote increased air circulation. Ideal for all season shoes. INSTRUCTIONS: After positioning carefully, remove backing paper and press the adhesive side firmly into place on a dry surface. Change once over used.