Mercury Grey

Size guide

Mercury is the first of a kind in many ways. It represents an element of change. As life, this iconic sneaker is filled with different layers. Enlightened. Its energy is everywhere.

Designed and handcrafted with care in Portugal.


- Full grain calf leather upper
- Ultra soft calf leather lining
- Full leather midsoles
- Natural cotton laces
- Cemented and stitched rubber sole
- Removable shock proof innersoles
- Extra slim innersoles for a loose fit
- Extra laces
- Cotton transport bag

+Shoe Care
Smooth Leather Care

Smooth Leather Care

€20.00 EUR

Restore your JAKs to their original look. Famaco Mink Oil wax, JAK cotton cloth, JAK horsehair brush.

+Free Shipping & easy Returns

Next business day shipping.
DHL/UPS Shipping with tracking number provided.
Free Shipping in the US and EU, free exchanges and easy returns up to 30 days.
Click here to learn more

38 5 6.5
39 6 7
40 6.5 7.5
41 7.5 8.5
42 8 9
43 9 10
44 9.5 10.5
45 10.5 11.5
46 11 12

Mercury Grey - Men

EU sizing. Fits true to size. Please select the size you normally wear. If you have wide feet, please consider sizing up.

If you have any questions, please email us at We are glad to help.


We source the finest components we can get our hands on and build sneakers that last, for a fair price, while ensuring that the people who work with us are ethicaly and fairly treated.
To achieve that, we sell our products directly to consumers.

Learn more about our story.

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Customer Reviews

Based on 127 reviews
z.s. (Brooklyn, US)

2nd pair of jak's, they're my go to sneakers since they are very comfy and very good looking

Clément J. (Paris, FR)
Amazing Mercury

Model is great, leather quality is top-notch and the finish of the shoes are great.

Andre E. (Manchester, GB)
Mens Mercury Black

Purchased size 46 Mercury Black. Very impressed by the quality of the materials on the shoe. Looking forward to wearing this for work and play.

Eric B. (San Francisco, US)
Great shoes

I live in the U.S. and have not been able to find all black shoes that I like anywhere until I visited Lisbon.

John S. (Utrecht, NL)
Possibly the best shoes I've had

I wanted a good pair of shoes that would last me a long time, would look better than most and is very comfortable.

A lot of "fast fashion" companies nowadays make the mistake of selling cheap goods that you throw away quickly. This generates more "revenue". The mistake they make is that if you produce something that is good and lasts years (if you take care of it), then people would come back for your products. People would simply buy different models. And this is what jak has realised. Consumer trust is way more important than quick cash. Make yourself irreplaceable, rather than usable.

The leather is simply superb. You can see that the shoes are handmade with passion and care - and I have received many compliments from friends and family.

I'm usually between 44 and 43. Jak's return policy allowed me to order both, try them to see which fits best and return the other one. I don't know who built their website and customer service systems, but these guys deserve a promotion. No problems there.

Finally, if you compare with competitors, pricing is hitting the sweet spot. Jak is, in my opinion, the best company for mid-range shoes price/quality-wise.

The shoes do the job. Look superb. Quality materials. Will last you ages. Little of what you pay is spent on marketing. No-bs approach.

That's all from me, hope it helps you in your decision to support this company.