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Casio Pro Trek PRG-340 vs Coros Apex 4 (42mm with silicone strap)

Weight and specs compared for 2026 — and which one to choose.

Coros Apex 4 (42mm with silicone strap) is the lighter option — 10 g lighter than the Casio Pro Trek PRG-340 (15% less weight). If grams matter to you, that is the one to beat.
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Spec Casio Pro Trek PRG-340 Coros Apex 4 (42mm with silicone strap)
Weight 66 g · 0.066 kg · 0.15 lb 56 g · 0.056 kg · 0.12 lb
Brand Casio Coros
Category Electronics Electronics
Casio Pro Trek PRG-340
66 g

Solar-powered outdoor watch with triple sensor.

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Coros Apex 4 (42mm with silicone strap)
56 g

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-340 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 10 g (15%) lighter than the Casio Pro Trek PRG-340 (66 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.

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