What material is recommended for the tandem loops in the Tandem Prusik Belay technique?

In the Tandem Prusik Belay technique, accessory cord is recommended for the tandem loops due to its specific characteristics that enhance safety and performance in rescue operations. Accessory cord is designed to be strong yet lightweight, making it easy to handle and ideal for rigging applications where space and weight are considerations.

The strength-to-weight ratio of accessory cord allows it to effectively bear the loads encountered during a rescue scenario, while its smaller diameter ensures compatibility with common knots and climbing hardware. Additionally, the specific weave and construction of accessory cord provide good grip on a rope, which is critical for the Prusik knot’s ability to hold under load without slipping.

While other materials like nylon and polyester offer durability and resistance to abrasion, they may not possess the same level of performance for this particular application when it comes to how they handle dynamic forces and the requirement for a reliable grip in a belay system. Kevlar, while incredibly strong, is not typically used in such applications due to its lack of elasticity and potential for damage under repeated load cycles.