Lithium O2 40k Jacket

When weather conditions become unpredictable and the summit line demands commitment, the Lithium Jacket 3L delivers high-level technical protection in a FAST&LIGHT format. Designed for ski mountaineering, alpinism, and demanding outdoor activities, its 3-layer 20D construction balances durability, lightness, and functional precision in every movement.

Its 20,000 mm waterproof membrane and outstanding breathability of 40,000 g/m²/24h create an effective barrier against rain, snow, and wind, maintaining a stable internal microclimate during intense ascents and changing pace. The helmet-compatible hood and harness-accessible pockets reinforce its alpine focus, while its minimalist design extends its versatility to less technical terrain. A versatile third layer built to move fast, light, and with maximum efficiency in the mountains.

FAST&LIGHT - 312 g. (S)

Activity

Alpinism, Skimo, Outdoor

Equipment

Double-slider waterproof YKK™ AquaGuard® front zipper

Helmet-compatible hood

2 waterproof YKK™ AquaGuard® zippered pockets, harness-compatible

Velcro cuff adjustments, glove-compatible

Hem adjustment with cord-lock

Inner zippered pocket

PFC-Free water-repellent treatment

Outdoor Fit: comfortable pattern without movement restrictions

Technology

O2 Membrane 3L 20k/40k

100% polyamide 20D, 93 g/m², 3-layer construction with PFC-Free water-repellent finish. It provides 20,000 mm waterproof rating and 40,000 g/m²/24h breathability, ensuring reliable protection against rain and snow while enabling efficient moisture transfer during high-intensity activities.

The PFC-Free outer treatment enhances water repellency without fluorinated compounds, reducing environmental impact while maintaining breathability and performance after prolonged use.

Weight

Size S: 312g | Size M: 333g | Size L: 349g | Size XL: 370g

Size Guide

Suggested Size Reference (Height/Weight)

Garment Measurements (cm.)