HTXJPN Gunma Black Sneakers


The Gunma Black is our new premium court shoe. 

Featuring ultra-soft full-grain calfskin leather sourced from a premium sustainable tannery, coupled with a breathable microfibre suede inner for comfort and wearability and a rigid heel panel for strength and support.

Bonus Customization Pack

Every pair comes with an Exclusive tin containing:

  • Second pair of laces in contrast white
  • Gold Lucky Cat Lace Charms
  • Chrome Turbo Lace Charms
  • Brushed Silver Gunma Lace Charms


100% 3oz Premium full-grain calfskin leather

Crystal PU Transparent window featuring 2 of Gunma's most famous mountain Touge runs, Japanese Rising Sun & Iconic Magnesium Wheel in the Heel.

Breathable Microfibre Suede removable moulded insole, with hand-stitched inner HTXJPN branding.

Breathable Microfibre Suede

Design Process

There is no doubt court shoes are on trend, everyone in our office wears them and they have been a long time on our to-do list.  When deciding to do our own take on the classic court shoe, we tore apart many pairs of shoes ranging from $99 to $500 luxury brands and took to the drawing board to build the ultimate sneaker.

  1. They had to be Quality Full Grain Real Leather.
    Synthetic is cheap to manufacture but wears badly over time and leaves your feet sweaty and smelly, we spent over 6 months sourcing and testing, with the final product full grain leather used coming from a premium sustainable tannery that supplies many high-end luxury brands. 
  2. They had to be value for money. 
    We're not a hype brand, our vision is always to create the most premium product for a good price.  Not only are these unique, but they are also one of the most affordable full-grain premium leather all-white on the market. 
  3. They needed to be comfortable for all-day wear.
    All the team have a pair, and we have been wearing prototypes for almost 12 months now, at the office, at the track, at the beach and in the car park. 
  4. They needed to have a high-top equivalent
    While most of the guys in the office wear lows, the boss prefers high tops. We are still testing them, and they should be launching mid-2023!
  5. They needed to be uniquely HardTuned JDM. 
    We are car guys, so we want automotive detailing and feature love for the areas of Japan we spend most of our time in.
  6. And finally...they needed to be customizable. 
    Again, we don't drive standard cars. why should our shoes not come with customizable options? We're keen to see what other personalization people do with their shoes!
    Fit & Sizing
    Size Chart


    HTXJPN shoes fit true to US Mens sizing, however lean towards being a slimmer fit shoe. Please measure your shoes against our size guide to ensure a perfect fit!

    • If you have a wider foot we recommend sizing up
    • If you wear a half sizes we recommend sizing up
      (Usually US8.5? order a US9)
    • If you vary depending on brand we recommend sizing up
      (Usually US10 or US11?, order an US11) 
    US 5 6 7 8 9 10 11 12 13 14 15
    EU 37 38 39 41 42 43 44 45 46 47 48
    UK 4 5 6 7 8 9 10 11 12 13 14

    - CM

    24.5 25.5 26.5 27.5 28.5 29.5 30.5 31.5 32.5 33.5 34.5
    - CM
    9.2 9.5 9.8 10 10 10.2 10.4 10.8 11 11 11.5

    Women's Sizing Info

    Generally, we recommend sizing down two size.
    Eg. If you are a US Women's Size 8, we recommend choosing US6


    Orders are dispatched from our Gold Coast HQ in Australia using Australia Post and DHL Express.

    We dispatch five days a week and aim to process all orders within 24hrs.

    Certain products such as window banners are custom-made to order so may take a little longer to dispatch.

    On weekends & public holidays, orders will be processed next business day. 


    FREE SHIPPING for all orders over AU $100 
      Tracking Estimated Time
    Standard YES 2-6 Days
    Express YES 1-4 Days


    *Shipping times frames are provided by the courier based on recent data. These times are to be used as an estimate and are not a guarantee.

    In the event of a large promotional period we may take a little longer to get your order dispatched, but will always prioritize orders by the date they were placed.

    For our Australian customers, we encourage you to download the AusPost app and register with the same email address as you used for your order to improve your delivery experience.



    If for ANY REASON you are unhappy with your purchase we offer a 100% refund on the purchase price if returned within 30 days.

    We also offer a 30 day exchange/replace/partial refund policy on all our clothing, covering any manufacturing faults or problems. It covers things like zips, overlocking, hems, prints, stitching, fabric, embroidery & any damage that occurred during shipping.

    It unfortunately does not cover change of mind, damage from incorrect washing, rolling in oil while working on your car, or general wear caused by doing burnouts or play fighting with your pitbull.

    To contact us with a warranty claim or return please visit our
    Returns & Exchanges page