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Cypher Climbing Mydas Ultra II vs SOL Thermal Bivvy

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

Cypher Climbing Mydas Ultra II is the lighter option — 146 g lighter than the SOL Thermal Bivvy (86% less weight). If grams matter to you, that is the one to beat.
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Spec Cypher Climbing Mydas Ultra II SOL Thermal Bivvy
Weight 24 g · 0.024 kg · 0.05 lb 170 g · 0.170 kg · 0.37 lb
Brand Cypher Climbing SOL
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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SOL Thermal Bivvy
170 g

Reusable emergency bivvy. Warmer than mylar alternatives.

Full details →

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Cypher Climbing Mydas Ultra II vs SOL Thermal Bivvy: which should you buy?

If saving weight is your priority, the Cypher Climbing Mydas Ultra II wins — at 24 g it is 146 g (86%) lighter than the SOL Thermal Bivvy (170 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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