This is what the Zcoil website says about their shoes:

At Zcoil, they recommend that for anyone who fits a half size, they can add  3mm innersoles under the Zcoil 

innersoles to make the shoes fit half sizes. These are included with these shoes.

DETAILS:

• Slip-resistant Outsole: Ensures stability.
• Replaceable Coils: Easily extend lifespan.
• Contoured Orthotic: Conforms to foot shape, protecting plantar ligaments.
• Thick Forefoot Cushioning: Enhances comfort.
• Wide Toe Box: Provides ample room for toes.
• Soft Removable Insole.
• Padded Collar and Tongue: Reduces friction, increases comfort.
• Soft Full-Grain Leather.
• Steel Eyelets: Easy lacing.
• Fits True to Size: Order your usual size; for half sizes, go up to the next whole size. 
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• A 3mm foam insert is included for a perfect fit.
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This shoe is ergonomically designed with Z Coils standard great fit features:

-a rounded, padded heel,

– a built in orthotic with a standard arch,

-a wider than normal toebox width for better fit in the toe area

-a padded tongue and collar for decreased abrasion

-a rocker bottom for easy mobility

-conical spring in the heel for 50% impact reduction to the body


What Size Do I Order?


Z-CoiL Footwear generally runs true to size.

Width


Z-CoiL footwear is very ergonomically designed.  Built with a rounded heel and raised arch we strive 

to support each contour on your feet.    The toe box of Z-CoiL is wider than normal shoes and designed

 to prevent irritation in the toes and ball of the foot.  In general, the ball of the foot is wide — however 

the width will vary slightly by style.  Its important that you wear shoes that prevent cramping or 

squeezing of the toes.  Tension on the toes can easily lead to bunions and disfigurement of the 

toes and ball of the feet.  Its important to sets your toes free and allow them to spread out naturally with each step.

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