Amazon.com : Haas Velox w/Clip and Go Technology : Sports & Outdoors
Tree Climbers Ascenders, HAAS VELOX ASCENT System, 08-98110 | eBay
Haas Velox Ascent System with Foot Loop - LCA U.S.A
Knee ascender" brought over from the arborist market. Is used with a foot ascender for really long ascents. Called the HAAS (Haul Ass Ascent System) : r/climbing
HAAS Velox Ascent Combo | TreeStuff
Climbing Technology Foot Ascender - Blue Ridge Arborist