Casio G-Shock Gravitymaster GR-B300-8A2 Black Dial 55mm Bio-Based Resin Men's Watch
SKU: 55786387293

Casio G-Shock Gravitymaster GR-B300-8A2 Black Dial 55mm Bio-Based Resin Men's Watch

Sale price$375.75 Regular price$417.50
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Ships within 48 hours · Estimated delivery Jul 8 - Jul 13

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Description

Casio G-Shock Gravitymaster GR-B300-8A2 Black Dial 55mm Bio-Based Resin Men's WatchThe Casio G Shock GR B300 8A2 is a professional grade aviation timepiece from the "Master of G" Air series, released in May 2024. Its design is inspired by the organic, flowing lines of next generation aircraft and fighter jets, featuring a seamless exterior that connects the case to the band for a cutting edge look. This model utilizes a Carbon Core Guard structure with a carbon fiber reinforced resin case, a material also found in aircraft

The Casio G-Shock GR-B300-8A2 is a professional-grade aviation timepiece from the "Master of G" Air series, released in May 2024. Its design is inspired by the organic, flowing lines of next-generation aircraft and fighter jets, featuring a seamless exterior that connects the case to the band for a cutting-edge look. This model utilizes a Carbon Core Guard structure with a carbon fiber-reinforced resin case, a material also found in aircraft fuselages, providing extreme shock resistance, rigidity, and corrosion resistance.The watch is equipped with a high-contrast 3D face design for intuitive reading, featuring a triple-layer dial with a rotary disc indicator at the 9 o'clock position. This indicator is driven by a dual-coil motor to smoothly display battery levels, alarm status, and stopwatch modes. For pilots and frequent travelers, it offers Dual Time to display two time zones simultaneously and a specialized Flight Log function to record coordinates and routes via the CASIO WATCHES app. True to G-Shock’s sustainability efforts, the case, bezel, and band are crafted from bio-based resin.

Shipping Notes
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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SKU: 55786387293

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4.0 ★★★★★
Based on 636 reviews
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Lesley
Lake Worth, US
★★★★★ 5
Hotel quality, budget friendly
Size: King, Style: Light
I’ve only used this for several nights. Overall I’m pretty happy with it, especially for the price. It is soft to the touch and has a nice, smooth feel. It’s lightweight but still provides enough warmth for mild to cool nights. I don’t like feeling weighed down when I sleep, so the light fill is actually a big plus for me. If you’re someone who sleeps hot, this is a solid choice. The corner tabs are super helpful. I paired it with a duvet cover and haven’t had issues with shifting or bunching. It also fits my bed well, though I could see it being a bit short on the sides if you have a very thick mattress. This is a great budget-friendly option and seems like it will be easy to maintain.
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Reviewed in the United States on September 19, 2025
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Verified Purchase
Chinaza Madu
Fort Morgan, US
★★★★★ 5
A Great Comforter for Everyday Use
Size: Full/Queen, Style: All-Season
I absolutely love this comforter! I love the fact it’s machine washable, and it held up really well after the first wash. It fluffed back up nicely, stayed soft, and didn’t lose its shape. It’s not too heavy but still cozy enough to keep you comfortable. For the price, the quality exceeded my expectations, and I am very happy with this purchase. I highly recommend 😊
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Reviewed in the United States on June 4, 2026
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Verified Purchase
Laurie A. English
Lake Worth, US
★★★★★ 5
Excellent down alternative insert
Size: Full/Queen, Style: All-Season
I purchased this down alternative for my Airbnb because we can easily wash it. I love that it is fluffy and warm and easy to put into the duvet. Price was great as well!!
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Reviewed in the United States on April 19, 2026
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Verified Purchase
Renee
Pawtucket, US
★★★★★ 5
Feels luxury, I approve
Size: King, Style: Warm
I have purchased high end comforters/duvet inserts and this one is somehow my favorite. It's so thick and fluffy. I was going to do the double duvet insert method to create an extra lush bed situation, but honestly it's not needed at all with this comforter! It poofs up wonderfully inside my duvet cover (king duvet, king insert) and it's like heaven. It's very cozy yet airy, and it moves well during the night and does not fee too heavy despite its weight. This thing is definitely on the warm end and probably won't be suitable for Florida summers, but depending on how you set the AC at night it could be fine! The comforter is weighty, it feels like quality, and has a soft fabric. I wouldn't use it without a duvet cover, that's more of an aesthetic choice but I like keeping it clean. The white is very white. Honestly, I will be getting another one simply because I'm so impressed. Definitely no need to drop $300+ dollars elsewhere.
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Reviewed in the United States on October 25, 2025
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Verified Purchase
Rosalie
Charlottesville, US
★★★★★ 4
ALL SEASON IS TOO WARM!
Size: King, Style: All-Season
I got the King, All Season, to squeeze into a Queen duvet for extra floof and it's sooo cozy. Highly recommend. I redacted 1 star though because although it says All Season, the amount of down in here feels like it's for winter. The first night I used it I woke up dripping in sweat. It's currently March, I live in Los Angeles area, hitting about 75° weather outside rn, but I sleep with AC full blast at night (usually hit about 64 when I wake up). I can't sleep with it, I'll need to buy the "cool" one, and hope that isn't tooo thin. Don't get me wrong, it's a great insert, but holy hell, it's too heckin' warm. I saw someone else mention it and wish I had honed in on their comment. I don't wanna return it as it was used, so I'm stuck with it now. *UPDATE* I am back because I also bought the "Cool" blanket as well after experiencing the heat of the all season and it too is also too hot for me. I've had a duvet before but I guess not filled to the capacity of these blankets. If you're a hot sleeper maybe look elsewhere?
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Reviewed in the United States on March 12, 2026

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