The ASTRO SIT sit harness is specifically designed for workers at height and rope access technicians looking for a lightweight and modular solution. It can be made into a full-body fall-arrest harness by connecting a TOP CROLL chest harness, for ascending a rope. The 3D foam padding and semi-rigid waistbelt and leg loop construction provide comfort throughout the workday. The textile bridge construction provides ease of movement and comfort when walking. The gated ventral attachment point allows the user to efficiently install the necessary equipment for progression. The waistbelt features metal side attachment points, equipment loops, and tool holder slots, allowing the user to organize and carry all the necessary equipment for a day of work. DOUBLEBACK self-locking buckles and FAST opening buckles make donning and adjusting the harness simple and convenient, even while wearing gloves.