I went tried on the new Simms G4 wading boot. I like the BOA system and was excited about the new sole design. They have a lot of ankle support which is a problem. They have TOO much ankle support. It was like walking with two steel pipes on my ankles. Just walking around the store within a minute they became painful as they tops were digging into my ankle area. They are the most uncomfortable wading boot I have ever tried on. Simms needs to put the new sole design on the Rivertek. That would be a great boot!