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Men's Onyx HP Classic Clays

$179.00 Sale
Our time-tested classic black Clays feature a thick, robust top grain leather that will age beautifully and is easy to clean. They feature a wide toe-box and zero-drop design to ensure a perfect, natural fit and a healthy gait. These classic grounding slip-ons are handmade with...
This style may require sizing up. For a perfect fit we recommend you measure your foot, or try them on by printing a template where provided. Size Chart
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Free Shipping & 30 day returns for members

Eco Friendly Natural Materials


Designed to Slip On and Off


These classic black Clays feature our non-slip heel padding for extra grip and comfort. The thick, robust top grain leather will age beautifully and is easy to clean. 


Best For: Walking, grounding, warmer weather, casual or formal wear.

Natural Healthy Stability. New true barefoot design that fits your foot like a glove. Wide natural shaped toe box and a zero drop sole, to keep your stride natural and steady. Natural rubber outsole for traction.

Versatile Design. Lightweight slip-ons, natural materials, breathable wear-with-everything classic style, great for the office, travel or a night out.

  • All Natural Renewable Materials
  • Non-slip heel padding
  • Proprietary clay paste instead of synthetic glues
  • Barefoot design - Naturally shaped toe box and zero drop
  • Full-grain premium leather upper
  • Vegetable tanned leather throughout
  • Fully lined with natural soft leather with our clay barrier
  • Water Buffalo leather insole & outsole
  • Minimizes odor and disperses sweat
  • Wear them with or without socks
  • 100% Copper Rivet conductor
  • Grounding - Earthing
  • 100% Cotton hammered waxed thread
  • Durable construction

Under-groundz members get FREE domestic standard shipping and returns in the US on every order. Every time. sign up

SALE shoes purchased during a sales period CAN be returned for a full refund minus $12 fee for a return shipping label.

Visit our Shipping & Returns page for more details. 


Clays should fit snug, even tight at first as they will stretch. They will “break in” and take the shape of your feet within days to a few weeks depending on frequency of wear.

If you are between sizes, we recommend sizing up, especially if you intend to wear the shoes with socks.

groundz logoSizeUSEUInsoleToe Box


Copper is highly conductive, durable and antimicrobial and is attributed with many health benefits. The copper rivet we use in our shoes acts as a conductor of electron flow from the earth to your body through the soles of your feet. Our unique leather sole allows for increased conductivity. The moisture of the outdoors and perspiration from your feet will increase the sole’s conductivity over time, making your leather soled Groundz the ideal grounding shoe.


"Zero-drop" non-elevated heel for proper posture, and a safer, more natural gait. No arch support to strengthen foot over time. Minimal naturally molding sole for added comfort without compromising foot stability. Feel the ground.


We have designed our shoes specifically with the natural shape of the foot in mind. A wide toe box lets your toes spread, grip better and relax when needed. Barefoot shoes that are foot friendly and foot shaped!


We use natural materials throughout - Sustainably sourced Eco-friendly leather dyed using chrome-free, water based and nontoxic vegetable dyes; Natural clay adhesive instead of synthetic glues and beeswax soaked cotton thread tying it all together. Respectful to the environment and to the health of the wearer.

What the Earthlings are saying

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