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The Beta SL Jacket Kasumi is a technical jacket for women, designed by the brand Arc'teryx for mountaineering, hiking and ski touring.
This fitted cut jacket, made from 100% nylon with a 3-layer GORE-TEX® ePE membrane, offers high-performance waterproof and breathable protection whilst being lightweight and durable. Its lining GORE® C-KNIT™ feels exceptionally soft against the skin and helps with the wicking away of sweat, ensuring optimum comfort during intense exercise. The jacket features an adjustable, helmet compatible StormHood™ hood, underarm ventilation zips for adjustable ventilation, and adjustable cuffs designed to be worn over gloves.
Certified bluesign® and featuring an integrated reflector RECCO® for enhanced safety in the mountains, this jacket combines technical performance with a commitment to environmental responsibility thanks to its PFC-free water-repellent finish.
With the Beta SL Jacket, you’ll have a reliable and functional jacket, ready to accompany you on all your adventures in extreme conditions.




- Central zip fastening
- Attached, adjustable hood StormHood™ with a laminated edge, compatible with a helmet
- Fitted cut and articulated design
- 2 zipped hand pockets
- Interior chest pocket
Velcro®- Adjustable cuffs, compatible with wearing gloves
- Zipped underarm ventilation
- Reflector RECCO®
- Certified bluesign®
Composition :
- Main fabric: 100% Nylon – GORE-TEX® ePE 3L 40D x 70D
- reinforcements : 100% Nylon - GORE-TEX® C-KNIT™
- PFC-free water-repellent treatment
| GORE-TEX® ePE | The ePE (expanded polyethylene) membrane in the new GORE‑TEX® products represents a key step towards responsible performance, delivering high-performance, sustainable products designed to offer a long service life. The brand-new GORE‑TEX® ePE membrane is lightweight, thin yet strong. To create a Gore Tex® product, the membrane is combined with carefully selected fabrics, such as recycled fabrics, whether solution-dyed or undyed***. * Contributes to Gore Textiles’ objective of eliminating PFCs of environmental concern from the life cycle of its consumer products. Here, this objective is achieved through the use of non-fluorinated materials. ** Thanks to the use of a new, lighter membrane and the textile(s) selected for the laminates (Higg MSI). *** Depending on the laminate used. |
| GORE® C-KNIT™ | Garments made using C-KNIT™ lining technology offer the durability of a 3-layer laminate combined with superior softness and drape at a higher level. Its unique, patented laminate construction features a precision mesh with a circular structure, which feels very comfortable against the skin. It’s a material that glides easily over other layers of clothes, whether base layers or mid layers. Clothes made using this lining technology are extremely breathable. The lightness of the material and the breathable construction of the lining, combined with a specialised lamination process, allow perspiration to pass through and escape more easily. |
| RECCO® | RECCO® is an avalanche rescue system used worldwide to help locate people quickly. The two-part system comprises a detector used by rescue workers and reflectors that are integrated into the clothes. A set of them enables quick positioning using radar, but does not replace the use of transceivers. |