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Cypher Climbing Mydas Ultra II vs Fox 40 Micro Whistle

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

Fox 40 Micro Whistle is the lighter option — 14 g lighter than the Cypher Climbing Mydas Ultra II (58% less weight). If grams matter to you, that is the one to beat.
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Spec Cypher Climbing Mydas Ultra II Fox 40 Micro Whistle
Weight 24 g · 0.024 kg · 0.05 lb 10 g · 0.010 kg · 0.02 lb
Brand Cypher Climbing Fox 40
Category Safety Safety
Cypher Climbing Mydas Ultra II
24 g

Ultralight carabiner at 0.85oz with 22kN rating. Wire gate design.

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Fox 40 Micro Whistle
10 g

Pealess safety whistle audible up to 1km.

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Cypher Climbing Mydas Ultra II vs Fox 40 Micro Whistle: which should you buy?

If saving weight is your priority, the Fox 40 Micro Whistle wins — at 10 g it is 14 g (58%) lighter than the Cypher Climbing Mydas Ultra II (24 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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