Fox 40 Micro Whistle vs Petzl Grigri+

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

Fox 40 Micro Whistle is the lighter option — 190 g lighter than the Petzl Grigri+ (95% less weight). If grams matter to you, that is the one to beat.

Spec	Fox 40 Micro Whistle	Petzl Grigri+
Weight	10 g · 0.010 kg · 0.02 lb	200 g · 0.200 kg · 0.44 lb
Brand	Fox 40	Petzl
Category	Safety	Safety

Fox 40 Micro Whistle

10 g

Pealess safety whistle audible up to 1km.

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Petzl Grigri+

200 g

Assisted-braking belay device for via ferrata and climbing.

Full details →

Fox 40 Micro Whistle vs Petzl Grigri+: which should you buy?

If saving weight is your priority, the Fox 40 Micro Whistle wins — at 10 g it is 190 g (95%) lighter than the Petzl Grigri+ (200 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 safety page, or browse the full gear weight database.

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