Casio G-Shock G-Steel Layer Guard Black Solar Mens Watch GSTS100G-1B

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Fresh off G-Shock's new "G-Steel" series, these timepieces provide environmental protection like never before. Designed with Casio's patented Layer Guard Structure, the G-Steel introduces a new level of shock resistance by creating a double layer bezel; the outer provides visual impact, while the inner resists physical impact. A tough rubber band has the durability of metal and water-resistance of rubber. Oversized hour markers and hands aid in visibility and have an ivory-like texture, while their multi-layered look gives it a complex, 3-Dimensional feel. 

  • Black, 59.1 × 52.4 × 16.1mm Stainless Steel case
  • Black, High-durability Casio Resin Strap
  • Black dial with Negative LCD Screens
  • Total weight: 97 grams
  • Layer guard structure
  • Shock Resistant
  • Double LED - Neon Illuminator for face, Super Illuminator for Digital
    Both: Full auto LED light, selectable duration (1.5 or 3 sec.), afterglow
  • Solar powered
  • World time
    31 time zones (48 cities + coordinated universal time), daylight saving on/off
  • 1/100-second stopwatch
    Measuring capacity: 59'59.99''
    Measuring modes: Elapsed time, split time, 1st-2nd place times
  • Countdown timer
    Measuring unit: 1 second
    Countdown range: 100 minutes
    Countdown start time setting range: 1 second to 100 minutes 
    (1-second increments, 1-minute increments)
  • 5 daily alarms
  • Hourly time signal
  • Hand shift feature
    (Hands move out of the way to provide an unobstructed view of digital display contents)
  • Battery level indicator
  • Power Saving
    (display goes blank to save power when the watch is left in the dark)
  • Full auto-calendar (to year 2099)
  • 12/24-hour format
  • Button operation tone on/off
  • Accuracy: ±15 seconds per month
  • Regular timekeeping
    Analog: 2 hands (hour, minute)
    Digital: Hour, minute, second, pm, date, day
  • Approx. battery operating time:
    8 months on rechargeable battery
    (operation period with normal use without exposure to light after charge)
    19 months on rechargeable battery 
    (operation period when stored in total darkness with the power save function on after full charge)
  • Module: 5445

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund as soon as we get the returned item.

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item. Once Return Authorization is given please return the item within 14 days. No packages will be accepted once the return period has expired.


We ship only to continental US, Alaska & Hawaii address. We do not ship to P.O.Box, APO/FPO address or make any International shipments.

All orders are processed and shipped in 48 HR period once the payment is approved and received.

All orders are shipped with Priority Mail service ( 2-3 days ) Some areas it takes an additional day ( Hawaii, Alaska and rural areas ). Please also consider that Sundays and Holidays will delay the delivery.

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