I have read that the Knightsbridge Strap works but read recently that their website had been “hacked” and should be avoided for the time being. The Knitsbridge strap differs from the others in that the chinstrap attaches to a cap toward the front so it doesn’t pull the jaw backwards.

Struggling with leaks in F&P Simplus since doc increased pressures from 13 to 22. Waiting for Airtouch F20 to arrive. Hoping for the best. Wondered where you sourced “not for sale” straps.