Regular boot
Heel shock absorption — fades as the foam packs down
Energy return — minimal
When the cushioning wears — buy new boots
Safety toe — varies
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$359.95
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$369.95
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$289.95
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$309.95
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Why a spring
Concrete doesn't absorb anything. So your body does.
Foam packs down in months and gives nothing back. A steel coil compresses about an inch on every step and returns 50% of the impact. When it finally wears, you swap the coil, not the boot.
Z-CoiL boot
Heel shock absorption — steel spring, consistent
Energy return — 50% of impact
When the cushioning wears — swap the coil
Safety toe — ASTM F2413-18 composite
Z-CoiL figures from independent lab testing. Read the studies.
Spring strength, matched to you
Four strengths by weight. Fitted to your size before it ships, swapped free if it isn't right.
Built to be rebuilt
Coils and insoles both replace. Replace a part, not a $370 boot.
Fit, covered
30-day risk-free trial in any condition. Free shipping and exchanges. 90-day workmanship warranty.
Questions from the floor
Will the coil pass my workplace footwear rules?
Will the coil pass my workplace footwear rules?
The Prime Work Boot Safety Toe and Outback Hiker Safety Toe carry an ASTM F2413-18 composite toe, which is what most warehouse and industrial footwear policies ask for. The coil itself is a chrome-plated steel spring; the covered-coil models enclose it, which some sites prefer. Not every policy is written the same way, so check the spec against your safety officer's list. If they want documentation, email painfree@zcoil.com and we'll send the spec sheet.
Are they heavy?
Are they heavy?
They're a work boot, so they're heavier than a sneaker, and the coil adds some weight at the heel. Most people stop noticing it within the first week because the spring is doing work the rest of the boot doesn't have to. The Outback Hiker is the lighter of the two styles if weight is your main concern.
How long does the coil last?
How long does the coil last?
It depends on your weight, your spring strength, and how many hours you're on it, so we don't quote a fixed number. What we can say is that the coil is a serviceable part: when it's lost its spring, you replace the coil from 69.99 rather than the boot, and the insole can be swapped any time too.
Do you make half sizes?
Do you make half sizes?
No. Sizing is unisex and runs true to size, so if you're a half size, order up. Every pair ships with a 3mm insert to dial in the fit, and if the size still isn't right, exchanges are free.
Can I use my HSA or FSA?
Can I use my HSA or FSA?
Yes. Choose Truemed at checkout to pay with your HSA or FSA, and the 30-day trial applies exactly the same way.
Frequently asked question
Frequently asked question
Provide an answer to the question here, with as much detail as possible to help your customers.
Pay with pre-tax dollars
Every boot on this page is HSA/FSA eligible through Truemed. Qualified customers save an average of 30%. Qualify in a couple of minutes at checkout, then pay with your HSA/FSA card.
Qualified customers save an average of 30%. Truemed is for qualified customers. HSA/FSA tax savings vary. Learn more at truemed.com/disclosures.
Buying for a crew, or through your employer?
Z-CoiL works directly with Workers' Compensation agencies on prescribed footwear, and offers bulk pricing for teams. Email painfree@zcoil.com or call 800-268-6239.
Foam flattens. Steel doesn't.
Try a steel spring under your heel for 30 days.
Full refund in any condition if it's not for you. Free shipping, free exchanges.
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