The edge of the skirt is slightly curved to increase the grip area, reducing discomfort and marks on the face for optimal comfort even during prolonged use. The double-button 3D tilting buckle makes it easy to adjust the silicone strap of the mask. The angled 4mm tempered glass lens guarantees excellent vision and great resistance. Seac Appeal is available both with a standard skirt for adults and with a "narrow fit" skirt for children and adults with thin faces.