Kortel Design Koncept Notice D'utilisation page 39

Koncept
Settings
Shoulder straps
Support the harness on takeoff.
Limit the pilot's inclination in the air.
Avoid the pilot's fall in the event of an upside down "flight".
Helps support the pilot in case of flight under the reserve parachute.
After checking in the gantry that it is possible to get in and out of the
harness, the shoulders sometimes need to be adjusted in the air for more
support and comfort.
We recommend close but not too tight contact to maintain good shoulder
mobility both during take-off and landing and in the air.
Back straps
Adjust the inclination of the pilot's back.
Leaning too much backward can make flight uncomfortable (poor vision) and make it
difficult to exit the harness on landing.
Too tight, it will be difficult to re-enter the harness after take-off.
Depending on the weight carried in the main pocket and/or ballast transport, this
setting may need to be changed in the air to re-balance the harness-pilot assembly.
More detailed information is available at www.korteldesign.com