Mountaineering sit harness (type C) in polyamide and ultra-high molecular weight polyethylene webbings with non-adjustable leg loops. Rope attachment by passing the rope through the two ventral webbings loops. Belay and rappel use with a connector through the two ventral webbings loops. Belt attachment and adjustment by automatic plastic buckle. Leg loops attachment by elastic closure device with a metallic buckle in 7075 T6 aluminium alloy.