With tweaks to the shock-resistant case and serious functionality upgrades, these watches are as formidable as they are ...

Casio launches the G-Shock Mudman GW-9502KJ-8 in Japan with an Earthwatch Japan design, biomass plastic build, Tough Solar power, Multi-Band 6, and full triple sensor features.

Both watches are Tough Solar, Bluetooth connected, and made entirely from biomass resin, which Casio has increasingly pushed as a more eco-friendly material.

Kristin is a lead editor at Forbes Home and has nearly a decade of professional experience as a writer and editor. She's previously worked at sites like Talking Points Memo, Insider, Delish, Angi and ...