Yates Speed Stirrups Adjustable Aiders. Designed by Hans Florine, Speed Stirrups are designed for speed jumaring ascending and cleaning while aid climbing. Simple clean design dramatically reduces bulk of traditional etriers. Speed Stirrups are not designed as a adjustable etrier but can be used in that function. 4 wide steps are made of 33 oz. vinyl haul bag material, built in keeper strap.