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LUNA Oso Flaco V Winged Edition Hardcore Trail 2022

Size Guide

NEW Luna Oso Flaco V Winged Edition for Real Hardcore Trails

The NON WINGS Retro Version is available on 


This rugged sandal is designed for real hardcore trails. Barefoot Ted has put the original Oso through rigorous testing on many trails including the Leadville Trail 100, where they performed exceptionally well.

Everything you need to feel secure and protected on the trail, with none of the extra weight or bulk. The ultimate minimalist trail sandal, featuring our grippiest Vibram tread, a super flexible sole with the utmost ground feel and and our patent pending Winged performance laces for an ultra adjustable, perfect fit.

Our patent pending Wing design allows for the simplest, most secure and intuitive LUNA experience yet! Wings keep your LUNAs securely in place without the use of a tech strap, while maintaining total lace adjustability and optimum comfort. Made of a flexible, smooth and very durable material, Wings are made to move with your foot and stand up to the gnarliest conditions.

  • How does it compare to the other sandal models?

    • The Oso Flaco V Wings & Venado 2.0 are our lightest, thinnest (7mm & 9mm respectively) models. Great for off or on road running or casual wear, and moulds really well to your feet.
    • The Mono 2.0 V Wings is our most versatile sandal. It's fairly thick (11mm), but also extemely light weight and mouldable. It has some grrrrreat traction for trail running, but not so much that it can't be used for road wear.
    • The Oso 2.0 V Wings (13mm + 4.5mm lugs) is secure and rugged, but also our heaviest, least mouldable option. If you need a tough, long-lasting sandal for rocky terrain or a trail ultra marathon, the Oso 2.0 V Wings is for you.
    • The Origen 2.0 (13mm) and Origen Flaco (10mm) are lightweight robust alternatives to the Oso 2.0 V Wings.  They have less aggressive tread than the making them ideal for distance road and trails. 
    • True Soul: Built by hand
      Weight: Mighty Light: 7.2 oz (single sandal, men's size 9)
      Dig In: 7mm base + 4.5mm lugs
      Sole: Vibram® Megagrip Outsole + Vibram® Midsole
      Footbed: MGT (Monkey Grip Technology)
      Laces: Supple, easy adjust performance laces kicked up a notch by our super secure, patent pending wing design
      Move Natural: A free foot is a healty foot. Always zero drop, zero toe-box, zero problems
      Vegan Friendly: Animal free product


    • The Oso Flaco V Wings comes with our secure and comfortable Performance 2 Winged laces. The Performance 2  winged laces include our LUNA Plug System, which consists of a soft, tubular nylon between the toes and a flat plug under the outsole for extended wear protection.

      The remainder of the laces are made up of a 5/8" climbing-grade tubular nylon with an extra padded heel strap, making the sandals easy to slip on and off. The all new buckle at the top of the foot allows for simple adjustments thanks to the ability to tighten and loosen the buckle and slide the strap up and down the toe strap. 

      All sandals with the MGT footbed and Performance 2 laces will be made with vegan padding in the heel strap, making them entirely vegan!

      **Note: The Performance 2 winged laces are not interchangeable with other laces at this time.**

      ALL NEW V WINGS MODELS DO NOT include the tech strap which is not required with the new wings attachment. 

    • We stand by all products we offer at LUNA.

      If you are not satisfied with one of our products or if they ever fail you, return them to us for a replacement, (partial or full) refund, store credit or repair.

      A reasonable charge will be assessed for damage due to wear and tear or for repair.

      For any production defect that you might encounter on your LUNAs, you have the MoonRock Guarantee. For example, your LUNAs should never delaminate on the sole or have its buckle or plug break during their lifetime unless they are purposefully abused.

      Even though many LUNAtics put thousands of miles on their LUNAs, it is hard to give a definite lifetime. How a LUNA wears will vary from person to person, model to model depending on the intended use, gait, weight, load, terrain, running form, and climate.

      These would void your MoonRock Lifetime Guarantee: Intentional misuse. Returns on products which show normal wear and tear but no defect. Any damage incurred from improper cleaning or self repairs (e.g. cutting or removing tags, cutting the soles of your sandals).

    Have Wings, Can Fly! from LUNA Sandals on Vimeo.

    Related Items

    LUNA Sizing
    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 
    The biggest issue people have is not having the template accurately printed, so double check twice. ;-)
    Simplest way to measure your foot is:  Heel against wall, mark on ground to longest toe, measure in cms, compare to chart below.



    Your Foot



    Mens & Womens


    LUNA Mens US LUNA Womens US the actual width of our sandal in centimeters Print
    21.9 - 22.2 3 4 6 9.2 Printer-icon
    22.3 - 22.6 3.5 4.5 6.5 9.4 Printer-icon
    22.7 - 23 4 5 7 9.6 Printer-icon
    23.1 - 23.5 4.5 5.5 7.5 9.8 Printer-icon
    23.6 - 23.9 5 6 8 10 Printer-icon
    24.0 - 24.3 5.5 6.5 8.5 10.2 Printer-icon
    24.4 - 24.7 6 7 9 10.4 Printer-icon
    24.8 - 25.2 6.5 7.5 9.5 10.55 Printer-icon
    25.3 - 25.6 7 8 10 10.7 Printer-icon
    25.7 - 26.0 7.5 8.5 10.5 10.85 Printer-icon
    26.1 - 26.4 8 9 11 11 Printer-icon
    26.5 - 26.8 8.5 9.5 11.5 11.15 Printer-icon
    26.9 - 27.3 9 10 12 11.35 Printer-icon
    27.4 - 27.7 9.5 10.5 12.5 11.5 Printer-icon
    27.8 - 28.1 10 11 13 11.7 Printer-icon
    28.2 - 28.5 10.5 11.5 13.5 11.85 Printer-icon
    28.6 - 29.0 11 12 14 12 Printer-icon
    29.1 - 29.4 11.5 12.5 14.5 12.2 Printer-icon
    29.5 - 30.1 12 13 15 12.4 Printer-icon


    LUNAcito Sizes (Not available in the UK so ask us)

    Length LUNAcito Sizes Print
    19cm K12
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    Hey LUNA Monkeys, I don't fit into any of your standard sizes, what can I do?
    Contact us on and we can see if there is a special make up sandal that could be available to your foot spec.