How to use it?4. Traveling by plane/long distance traveling. 5. Cross fit and triathlon trainingcare instructions:gently hand wash in cold water with mild soap. Line dry in shade first from the outside and then invert it to dry from the inside. Do not machine wash, bleach, Iron, dry clean or tumble dry.package includes: 1 pair of moisturizing silicone gel heel sleeve in a sealed polybag.