Ideal for use on heels. Designed to provide cushioning from painful blisters and to shield from further rubbing. These are our most advanced plasters. They work differently than traditional plasters. Shows it's working. -Product will swell and a white bubble will form to show the healing process has begun. Cushioning. - Provides protection and relief from painful blisters. Long lasting. - Stays on for multiple days, even through showers. Multi-day protection. Hydrocolloid gel plaster.