Oso Flaco

Size Guide

Oso Flaco Specs

Made in Seattle, USA.
Weight: 7.2 oz (single sandal, men's size 9)
Thickness: 7MM base + 4.5MM lugs
Sole Non-Marking  Vibram® Megagrip Outsole + Vibram® Midsole
Laces: Performance Laces 2.0 *Patented
Vegan: Yes

LUNA Sandals - Vibram MegagripLUNA SandalsLUNA Sandals - Seattle Made

Take the Oso 2.0 and shave it down to its “bear” essentials and you have the Oso Flaco (“Skinny Bear” in Spanish). This sandal is for those who want the most aggressive tread pattern for crazy grip, but also want super flexibility and full ground feel.

Customer Reviews

Based on 200 reviews
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    Sarah B.

    Love it!

    Bought them in Seattle while visiting family. Loved the shop and the experience there. The sale person was great and very attentive to my needs. I love the fact that I can grip with those sandals on all kind of terrain, even wet rocks! Best of all is that I can actually still feel the ground under foot but save my skin on rugged terrain. I got the tabis as well and it is such a great combo in wet and cold weather or if I just feel like a bit extra protection. I am not looking at anything else for a long time...

    Robert F.
    United States

    Great Sandal

    The Luna Sandals our a very high quality product. The Oso Flaco I use primarily for trail running and hiking. I live in North Central Pennsylvania which has very wet, rocky, rooted and mountainous trails. This has been the only sandal I have tried so far that stays on your foot well when wet. When mud and steep inclines are combined...that is the only time the sandal does get compromised a bit...everything has its limits. Great product...thank you!

    Andrea Gad

    Amazing sandals

    I have had 5 different sandals in the last month, none of them has the perfect fit and grip like those ones. I did buy the tabus, they do keep my feet warm as I live in the North East, and it gets pretty cold here. Shipping took 2 days, went for my run today, I have never had such An amazing run before. One thing u need to use the template, my size when I measured my feet didn't match the template at all and I had to change my size, which brings me to cusotner service is awesome, they changed the size for me twice not once Thank u Luna :)

    Alison C.
    United States

    My favorite Luna's yet!

    Love these for trail running. I wear a 10.5 in Nike and got a size 10 in Oso Flaco. I may even size down a little more next time so there's not much sticking out beyond my toes to trip over.


    Love the Sandals

    Probably one of the best sandals I had so far. Lightweight, but a nice snuck fit. Great for casual summer days.