I have 2 pairs of the Heidi boots. I bought them after purchasing and wearing the Erin shoes all summer. They seemed to have a similar design. I love the Erin shoes for my plantar fasciitis. They are the only sneaker/shoe I have been able to wear throughout the day with no pain. (And I have tried so many different brands of sneakers) The Heidi boots have been good so far. They are equally as supportive and my feet have survived the day with no pain. The only difference is the Heidi boots slip a bit when you walk and don’t fit super tight. They also stretch out, so when I first put them on they were tight, and I was worried they would not be a good fit. After a day of wearing them they were stretched out. They are definitely a looser fit than the Erin, but very comfortable and not too hot. I usually wear a 7 in sneakers, but My Erin and Heidi shoes are all 6 1/2. Tight at first…but perfect after a day of wearing them.