and ergonomic

chest and back

bluesign® is the world's strictest standard for environmental protection

but tree climbers also use it as their positioning lanyard

ISC Singing Tree Rope Wrench Colour:Gold and ergonomicThe ISC Singing Tree Rope Wrench is a revolutionary SRT climbing tool. Manufactured by International Safety Components (ISC) in Wales, the Rope Wrench simplifies single rope ascent, especially when combined with a FIX tether. The Rope Wrench comes with a mid line pin to allow quick installation on a climbing line, and the hex head bolt allows for quick installation of a tether. Over the past four years, the ISC Singing Tree Rope Wrench (STRW) has