AV MURUCK Caving Sit Harness

For caving schools, clubs and adventure parks fitting a wide variety of body shapes — from teenagers to large-build adults — a sit harness with a generous adjustment range is more practical than a tightly fitted personal model. The MURUCK answers exactly that brief: a 55 to 125 cm waist range across its four sizes makes it a daily-driver teaching harness rather than a niche size-specific product.

How to choose your size

The MURUCK comes in 4 sizes, each identified by an integrated colour mark. The choice is based on two morphological criteria: waist circumference and leg loop circumference, measured while standing relaxed.

If your measurements fall in an overlap zone (for example waist 55-75 cm valid for both XS-M and M-L), choose the size that places your dimensions in the middle of the adjustment range rather than at an extreme — the final fit will be more stable and more comfortable under prolonged suspension.

Technical specifications

• Manufacturer reference: AVSP01 (root; 4 size variants AVSP0101 to AVSP0104)
• Weight (size M-L): 620 g
• Main webbing: 44 mm wide
• Removable PVC reinforcements on leg loops (rock abrasion resistance)
• Steel pass-through buckles (webbing folded back through the buckle for adjustment)
• 2 low sheathed attachment points (caving-standard configuration, optimised for rope ascents)
• 1 fixed sheathed gear loop
• 1 mobile flat-strap gear loop
• Colour: solid red with size-coded colour mark (yellow / blue / purple)
• Customs code (NC8): 63079098
• Notified body: n°0082 APAVE SA (6 rue du Général Audran, 92412 Courbevoie cedex, France)
• Minimum certified strength: 15 kN (EN 12277 standing position test)
• Steel connectors supplied: compliant EN 12275:2013
• Maximum gear loop load: 5 kg
• Maximum service life: 10 years from first use, 13 years from manufacture (3 years max storage + 10 years use, per technical notice AVSP01-20250113)

Recommended uses

Cave exploration and rope progression (SRT — Single Rope Technique), club teaching and caving school programmes, group equipping for adventure parks and canyoning organisations. The MURUCK is especially valued as a teaching and rental harness thanks to its wide morphological range: the same harness can fit successively a teenager and a large-build adult.

Key strengths

• Very wide adjustment range: waist 55-125 cm depending on size, ideal for collective-use structures
• Steel pass-through buckles: precise adjustment and durable hold, no progressive slippage
• Removable PVC reinforcements: rock abrasion resistance, removable for maintenance or replacement
• Integrated size colour mark: immediate visual identification in a group (yellow XS-M / blue M-L / purple XL)
• 2 low sheathed attachment points: caving-standard configuration optimised for rope ascents

Periodic inspection and service life

The AVENTURE VERTICALE MURUCK caving sit harness is a personal protective equipment (PPE) of Category III. It must be visually inspected before each use by the user and undergo a thorough examination by a competent person at a frequency defined by local regulations or manufacturer recommendations (typically at least every 12 months).

For UK and English-speaking practice, see the British Caving Association (BCRA / BCA) for instructor-grade equipment guidance, and the Fédération Française de Spéléologie for the original French federal recommendations and NF S72-701 standard.

Warranty and certifications

Official documentation

• British Caving Association (BCA / BCRA) — UK federal reference for cave exploration and instruction