The Morf nasal mask is designed with a unique ThermAcryl® seal that is heated and formed perfectly to the contours of each user’s face. Once formed to the face, the firm seal reduces pressure sores, mask movement and prevents silicone allergies. The ThermAcryl seal material also reduces the size of the mask, improving vision and reducing claustrophobia. The durable seal extends the life of the mask reducing the need for frequent seal replacement.