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  • The Go Natural with io Nude Ultra

    At io we’ve always been about going natural. And now it’s time to go ‘au naturel’ by going io natural in our first ever, and possibly the world’s first ever, Nude Ultra. No synthetics. No harmful microplastics. No landfill. No nothing. Do it for the planet people!

    FAQs
    Where will this event be held?
    We’re just awaiting final approval for courses across Australia but the locations will be Sausage Gully (Victoria), The Butt (Tasmania), Flirtation Hill (NSW), Fanny Creek (NT), Yorkey’s Knob (Qld) and Cockburn (SA).

    What distances will there be?
    You can choose from 10km, 25km, 50km or the Full Monty 100km. Shoes and (natural merino) socks allowed. Or enter the Birthday Suit Barefoot Ultra and wear literally nothing at all. It’s up to you.

    Is there a mandatory gear list?
    No, we’ll have a list of things that are mandatory to not have. And it’s clothes. Because it’s a Nude Ultra. So no synthetics. This event is all about keeping it natural. (Hydration devices allowed. If you want to take a collapsible cup to refill at the support stations, where you store that is up to you.)

    If ioMerino is natural, why can’t I run in that?
    Because this event would be nowhere near as legendary if it was a Nude Ultra where you actually wore clothes. But yes, absolutely, io is the way to go if you want to keep things natural. 

    Are there support stations along the way?
    There will be support stations approximately every 5kms offering water, Tailwind, gels, chips, lollies, sunscreen and anti-chafe creams.

    Isn’t a nudie run illegal?
    Probably. But hey, live a little.

    Could running natural cause some sort of injury?
    We expect all runners to run within their own abilities and body types.

    Is this a body positive/inclusive event?
    You bet your bottom it is. You can be any size from XS to XXXL and beyond. We don’t care how you look, we care that you’re awesome. And if you got this far in these FAQs, you’re definitely awesome.

    Is this all some sort of stupid April Fool’s joke?
    Yes. Yes it is. If you really like the idea of ditching the stinky synthetics and keeping things natural, just go with io.

    Let customers speak for us

    from 1875 reviews

    The only socks I wear for work, they feel great and never smell.

    David
    Hiking Socks
    Black yoga pants xxl

    Very comfortable , great length , fantastic for travel, would recommend, great quality

    Bernadette Hogan
    Yoga Pants

    They are great, warm, and comfortable even while running.

    Ann Dohnt
    Altitude Neck Warmer
    First impressions

    Good fit good comfort

    Clifford Grove
    Altitude Boxers - Ready for Adventure
    Love it

    Looks and feels great. Has kept me warm under my jacket in Boston. My second one of these and love it

    Vanessa M
    Ultra Zip
    Comfort and smart enough to wear out

    Comfort and smart enough to wear out.

    brendan finnigan
    Glacier Tracksuit Pants
    Worth the expense

    Best and most comfortable merino clothing for the UK and Canada winter. A must buy is the base layers. Tops and leggings. Very happy with my purchase.
    Easy to care.
    Can't wait to use my gear for next trip to Finland 2025.

    Graham White
    Altitude Tee - Southern Cross
    Spot on

    Great slogan as well. As used by owners of e72.au

    G Daly
    Universal Nature Tee
    Perfect

    All set for winter!

    G Daly
    Altitude Crew
    Fantastic for the Camino/long hikes

    I wore this tee on the Camino and loved it. I hand washed it every second night and by morning it was always dry. I love the dazzling blue colour, the higher neckline was great for preventing sunburn and the sleeve length was perfect. I only had two tees with me for 42 days and I never tired of wearing this tee. It has kept its shape and has plenty more wear left in it.

    S.
    Universal Tee - Explore All The Places
    Walked the Camino in them

    Fantastic for hiking and everyday use. I bought two pairs of the bikini briefs for the Camino (40 days of walking) and they were fantastic. They dry really quickly. I would hand wash out a pair at night, roll them in a towel to get the excess moisture out, hang them up and by morning they were always dry. The hot pink colour made them easy to find in my pack too. Love them!

    SUSI
    Zodiac Bikini Brief
    Altitude Boxers

    The boxers themselves are excellent. Great material and a great fit. What set ioMerino apart was the proactive customer service. I was very impressed

    David Fell
    Altitude Boxers - Ready for Adventure
    Best ever socks

    These are the best socks I have ever had. Cushioned and extremely comfortable, they fit in my shoes like much thinner synthetic socks, they can be worn for days before they need washing and they don’t walk down into my shoes.

    Maggie Ramsay
    No Show Socks
    A great investment

    This jumper is going to be my new best friend, even in Australian spring/autumn (or Melbourne summer!).
    In Norway at present - well and truly minus- and it performs wonderfully as a layer, or a quite-dressy top indoors.
    I'm really pleased with the quality, and it's NOT made in China!

    D W
    Pinnacle 2.0
    Altitude Zip

    Perfect for when riding my bike. Long sleeves are great for keeping the sun at bay. I find it breathes well and wicks very nicely. Highly recommended.

    Neil Penny
    Altitude Zip