“The problem is I can't get them to lock my foot in place, when I tried it either didn't work or the strap dug into my foot. Is this just something you have to put up with or am I not sizing my sandles right.”
Keens are very tricky to get sized right for high mileage backpacking. Our scouts who tried keens struggled with them rolling. Also, they became a nuisance when sand and debris built up into the toe bed. Another struggle with the Keen is the feet sweat profuciously in the summer, as if you were wearing gortex boots; not to mention, they are a little heavy. Again this is just my insight as others have figured out these critters.
The Teva’s, at least for the Hurricane II and Terra Fi 2, are sized like this:
1. To not roll the ankle, a WIDE footbed is needed. This doesn’t mean your foot needs to be wide. The wide footbed just makes it harder for the sandal to ‘roll’ over. I think some Teva’s are best at this.
2. First make sure you get the next size up. I usually wear 8-8.5 thus I buy a 9.
3. Unstrap all 3 straps.
4. Center your foot such that your arch perfectly rests on the sandal arch. Do this with your regular hiking sock on.
5. Strap the back strap. This strap should never have to be touched again. But just double check that your arch is sitting comfortably.
6. Now cinch the ankle and then toe strap tight; not to tight, but it needs to be tight enough so the ankle won’t roll with the sandal sole still on the ground.
Now you have become one with a teva tera fi2 and are able to wiggle your toes in the wind. It’s almost like cheating.
Disclaimer: I wish Teva paid me.