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LUNA Retro Oso Flaco Sandals

Size Guide
Size Guide - LUNA Sandals
LUNA Sizing - SIZING CHARTS - shoe size
THE SIMPLEST WAY TO DETERMINE SIZE.
Find Your True Fit

MENS SIZING IS NEARLY ALWAYS 1/2 SIZE SMALLER THAN REGULAR SHOE SIZE AND WOMENS SIZING IS USUALLY TRUE TO SIZE. 
Once you've determined your size, you can double check it by clicking the corresponding Printer Iconand printing out a template.
When printing our copyrighted PDF templates, make sure the "Scale" in the Print Window is set to 100% or the template won't be accurate.
If using the Chrome browser, make sure the "Fit to page" checkbox is UNCHECKED.
After you print out the template, also double check the scale by comparing a ruler to the ruler that prints on the template.
Toes should be close to edge, but not hang over. Want our opinion? Send a photo of your foot on the template to support@lunasandals.com or message directly from your phone to 855-586-2726 <<
The biggest issue people have is not having the template accurately printed, so double check twice. ;-)
We can also send you our sizing templates. Order here.

ADULT SIZES

(Centimeters) Your Foot Mens US Womens US EU UK actual width in centimeters Print
21.9 - 22.2 4 6 36 3 9.2 Printer-icon
22.3 - 22.6 4.5 6.5 36.5 3.5 9.4 Printer-icon
22.7 - 23 5 7 37 4 9.6 Printer-icon
23.1 - 23.5 5.5 7.5 37.5 4.5 9.8 Printer-icon
23.6 - 23.9 6 8 38 5 10 Printer-icon
24.0 - 24.3 6.5 8.5 38.5 5.5 10.2 Printer-icon
24.4 - 24.7 7 9 39 6 10.4 Printer-icon
24.8 - 25.2 7.5 9.5 39.5 6.5 10.55 Printer-icon
25.3 - 25.6 8 10 40 7 10.7 Printer-icon
25.7 - 26.0 8.5 10.5 40.5 7.5 10.85 Printer-icon
26.1 - 26.4 9 11 41 8 11 Printer-icon
26.5 - 26.8 9.5 11.5 41.5 8.5 11.15 Printer-icon
26.9 - 27.3 10 12 42 9 11.35 Printer-icon
27.4 - 27.7 10.5 12.5 42.5 9.5 11.5 Printer-icon
27.8 - 28.1 11 13 43 10 11.7 Printer-icon
28.2 - 28.5 11.5 13.5 43.5 10.5 11.85 Printer-icon
28.6 - 29.0 12 14 44 11 12 Printer-icon
29.1 - 29.4 12.5 14.5 44.5 11.5 12.2 Printer-icon
29.5 - 30.1 13 15 45 12 12.4 Printer-icon

 

LUNAcito Sizes

Length LUNAcito Sizes Print
19cm K12
 >>View Template
Printer-icon
19.8cm
K13
 >>View Template
Printer-icon
20.6cm
K1
 >>View Template
Printer-icon
21.5cm
K2
 >>View Template
Printer-icon
22.4cm
K3
 >>View Template
Printer-icon
Colour: Black
Black
Size: US M5.5/W7.5 EU37.5

1 item left

LUNA Retro Oso Flaco Sandals Black US M5.5/W7.5 EU37.5

Black / US M5.5/W7.5 EU37.5

2026-07-02 2026-07-09

DESCRIPTION

For those who demand the best in performance focused minimalist footwear that can handle the BIG adventures, the Oso Flaco is super attractive.

Using our specially developed Vibram Megagrip studded tread, we've built a sandal that can handle the complex world of real adventure: mountains, rivers, trails, mud.

SPECIFICATIONS

Weight: 7.2 oz (single sandal, men's size 9).
Thickness: 7MM base + 4.5MM lugs.
Sole: Waterproof Non-Marking Vibram® Megagrip Outsole + Vibram® Midsole.
Footbed: MGT (Monkey Grip Technology).
Laces: Performance Laces 2.0 with Tech Straps *Patented.
Vegan Friendly: Animal free product.
Made in USA or Vietnam (Learn More).


SIZING & FIT

Most men tend to size down 1/2 to a full size with LUNAs.

Most women are true to size.

With LUNAs, you want a close fit and not a lot of space around your foot.

For more detailed guidance and support, please visit our size guide.

 

VIBRAM® BABY!

Have you ever noticed how high-quality things work better, last longer, feel right? That’s why we’ve always been drawn to the finest SOLE materials the world can provide. Vibram® is world famous for being wizards in the field of soles and working with them, we’ve perfected OURS.

Retro-verted?

Some people just can’t stop loving a great thing, or want to love something new that is old. What can we do for you? Easy! The RETRO line of LUNAs uses our tried-and-true PRE-WING lacing system known in the day as ATS (All-Terrain-Strapping) laces. You can have’em just like dad did in 2012!

BUCKLE UP BUTTERCUP

What’s so special about our lacing system? Infinite adjustability! Even our buckle can move freely on our patented one-continuous-loop lacing system. If you follow the webbing it goes from your toes all the way around to the top of your foot in one continuous fully adjustable loop. Foot freedom with security is real.

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