Our innovative iON SYNC® Earthing Plugs have been developed over several years of dedicated research and development to create a highly durable and conductive solution for enthusiasts of earthing shoes.
When installed through the soles of shoes, iON SYNC® plugs offer users an unparalleled grounding experience that replicates the benefits of being barefoot.
These plugs are offered in three sizes, suitable for grounding shoes with thicknesses ranging from 4-15mm (3/16 - 5/8"). Please refer to this table to find the right size for your shoes, and find written -and- video instructions below.
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Shipping
Your order will ship out via USPS within 3-7 business days of receiving it. All orders placed by Monday 7am Pacific will be shipped Thursday. Orders placed by Thursday at 7am Pacific will ship Monday. Any changes to your order must be requested within 24 hours of placing your order.
All sandals are made to order in our Sonoma County workshop. *Please note we cannot guarantee changes made to your order 24 hours after it has been placed*
Domestic:
- First Class Mail cost $3-5 and takes 3-5 days for delivery from ship date.
- Priority Mail (flat rate) cost ~$7 and takes 2-3 days for delivery from ship date.
- Priority Mail Express (flat rate) cost $22.38 and takes 1-2 days for delivery from ship date.
International:
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We ship worldwide with Delivered Duty Paid (DDP) shipping options to help avoid unpredictable customs fees and shipping delays. Shipped via FedEx, DHL & postal mail, taxes & duties included. Learn more here.
- DDP Priority: average 9-14 day transit time.
- DDP Express: average 7-10 day transit time.
- DDP ePacket (Canada only): average 9-12 day transit time.
*shipping costs are estimated based on the weight of 1-3 items
1% Donation

Earth Runners are inspired by ancient huarache running sandals. We are grateful to the Tarahumara for originating this design and feel fortunate to have the ability to give back and honor the creators of the huarache running sandal.
We donate 1% of all sales to True Messages, a non-profit focused on honoring the running heritage that remains so important to the Rarámuri culture. True Messages listens to the input of the local National community to determine where to allocate resources which includes sponsoring races, trail projects, and initiatives to support the youth of the community.
Thank you for helping us support the Tarahumara!