Arc'teryx Lithos SL Harness

Dynamic, light, and precision-engineered for sport climbing, the Lithos SL Harness feels almost weightless whether you're warming up or going for the redpoint. Featuring the next evolution in Warp Strength Technology, the Lithos SL strikes the perfect balance of support, comfort, and durability, meeting the demands of the most committed sport climbers, session after session. Plus, with a revolutionary sizing system, you can customize your fit like never before, dialing in the perfect waist-to-leg-loop ratio for all-day comfort.

Size and fit tip: The Lithos SL introduces our new harness-sizing system—just match your waist and leg loop sizes from the chart to customize your perfect fit.

• Lightweight, durable construction optimized for repeated use

• Built using the latest evolution of Warp Strength™ Technology, providing an ideal blend of support, comfort, and long-term durability

• Structural fabric is integrated across the back panel, reducing bulk while increasing support and preserving the harness’s slim 2 mm waistbelt profile

• Two snap-fit, moulded gear loops are positioned for easy clipping and can accommodate a full set of quickdraws without adding unnecessary bulk

• An updated sizing system allows for precise adjustment between waist and leg loops, making it easier to achieve a balanced, comfortable fit for extended sessions

• Leg loops use a single, continuous webbing design, removing high-wear stitching in critical zones to enhance durability and improve mobility

• Forged buckle offers smoother cinching for a secure fit and simplifies putting the harness on and taking it off

• Elastic rear rise can be unclipped one-handed—even while wearing the harness—and is fully replaceable to extend the product’s lifespan

• Manufactured using materials that meet bluesign® criteria

• Primary and secondary fabrics are bluesign®-approved

• PFAS (per- and polyfluoroalkyl substances) compliant

• Imported

• The harness is offered in six waist sizes, each available with two leg loop options

Waistbelt sizing: Sizes range from 1–6, with each size corresponding to a defined waist measurement range

Leg loop options: Each waist size is available in A or B configurations

• A: Smaller leg loop circumference with a standard rise

• B: Larger leg loop circumference with a longer rise

Rise refers to the combined measurement of the leg loop circumference and the connecting webbing between the two leg loops. This measurement affects how the harness sits while hanging and is influenced by pelvic depth and how fully the thighs fill the leg loops.