Petzl Croll Size:Small All Yale Loopie Slings are

All Yale Loopie Slings are rated with a Safe Working Load Factor of 5:1

So speed regulation is very easy

ASTRO BOD FAST international version features leg loops with FAST automatic buckles

Used together with Futura Hand and Futura Foot it's the best support  to ascend a rope with the "ROPE WALKING SYSTEM" (as if climbing a ladder)

Petzl Croll Size:Small All Yale Loopie Slings areChest rope clamp Designed for rope ascents, the CROLL ventral rope clamp is simple to use, thanks to its pinch opening system, which is totally integrated in the clamp to avoid any involuntary snagging. The attachment holes ensure efficient positioning during ascents. It is available in two versions to adapt to different rope diameters.