Casio Pro Trek PRG-300 vs Coros Apex 4 (42mm with silicone strap)
Weight and specs compared for 2026 — and which one to choose.
Lightweight outdoor GPS smartwatch with triple sensors, barometric pressure, and Tough Solar charging. Compact 56×47×12.6mm design.
Full details →Rugged mountain sports GPS watch with AMOLED display, up to 85hr GPS battery. 56g in 42mm size, available with nylon strap option (lighter at 51g)
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Casio Pro Trek PRG-300 vs Coros Apex 4 (42mm with silicone strap): which should you buy?
If saving weight is your priority, the Coros Apex 4 (42mm with silicone strap) wins — at 56 g it is 1 g (2%) lighter than the Casio Pro Trek PRG-300 (57 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.
See where both rank against everything else in this category on the lightest electronics page, or browse the full gear weight database.