After use shoes a 1st time finding an allergy to red dye present in the interior of the strap. Stop use and recovery 10 days after disappearance of allergy. Again redness and swelling finding places with dyed red. My message to Amazon, no return of the survey was to be conducted ???? still no refund. I do not despair of an answer !!! This is a Chinese manufacturing and we know that the problems have already been constatés.Si no response information will be given to relevant associations or services in the Amazon to reproach matière.Pas the moment but you can not leave do anything ???