We race Pro Outboard Hydroplane race boats. I purchased the Mion Flood Tide II water shoe to wear in the pits for caring our boats in and out of the water between heats. The first thing I notice is that one shoe had a 2 inch longer lace so I could not hook properly to secure the lace. Within five minutes the shoes began to rub on my ankles. After about an hour the shoes had rubbed open sores on my ankles. So I had to switch to a pair of Walmart specials for the rest of the weekend. Whem I reached home my ankles were infected and I had to make a visit to my family doctor. I have since returned the shoes. I know I have read that some others have loved the shoe and some like me had problems with them rubbing on the heal.