I purchased the Tirra because it has the molded footbed and I was going to be doing a lot of walking. I wanted to replace my Terra Fi Lite sandals which I love!! They don't make them anymore- so broken-hearted!! The Tirra fit well but the strap across the top of my foot seemed short- there is about an inch or more of the Velcro showing. My feet are normal (maybe even skinny?) so I don't know why the strap isn't longer. They were comfortable but I just wish I could have the Terra Fi Lite style!!
