Using the Petzl Macchu Kids Climbing Harness is simple. First, adjust the waistbelt and leg loops to fit your child properly using the DOUBLEBACK buckles. Make sure the fit is snug but not too tight. If you're using the optional BODY shoulder straps, attach them and adjust to keep your child in an upright position. When climbing, always double - check that the belay device is correctly attached to the belay loop. For maintenance, after each use, inspect the harness for any signs of wear or damage. If it gets dirty, you can gently hand - wash it in lukewarm water with mild soap and let it air dry. Avoid machine - washing or using harsh chemicals. Keep the harness stored in a cool, dry place away from direct sunlight. Remember, this harness is for children under 40 kg, so always check your child's weight before using it.