To further aid athletes in gliding as aerodynamically as possible, they wear a one-piece fabric bodysuit more similar to a wingsuit than a ski suit. It is composed of five layers and is both loose-fitting and porous enough to allow up to of air to enter and to pass through. This generates yet more lift, but the amount of slack is stringently regulated by the FIS so as to not allow for excessive bagginess and thereby reducing its wingsuit-, sail- or parachute-like properties. In the early 2000s, bodysuits had reached exceptionally baggy proportions, resulting in humorous comparisons to flying squirrels. A ban on these baggy suits came into effect soon after, and today the level of slack for bodysuits is measured by FIS scrutineers at "equipment control", led by Sepp Gratzer, before and after each jump. If the level is exceeded, that athlete is disqualified due to an "equipment violation".