I have been a loyal user of full-face masks for approximately ten years since commencing my ASV therapy journey. However, despite trying various sizes and configurations, including both silicone and foam options, I have never found them to be particularly comfortable. Initially, I was somewhat hesitant to believe that a pillow-type mask could offer a superior experience, but I was determined to give it a chance in the hopes of discovering a more enjoyable and comfortable solution. The F40 model has exceeded my expectations and proven to be significantly more comfortable than its predecessors, the F20 and F30.