Tusa`s line of freedom masks are specially designed to offer superior fit, comfort, and performance. This mask fits a variety of different sized faces due to a dimpled skirt surface, which is ideal for scuba divers and snorkelers who need a little growing room. The rounded skirt edge provides a soft seal around your face, suppressing the pressure against your face at depth to reduce crease marks. No more red lines! unlike most mask straps, the freedom hd mask uses 3-d strap technology. Most mask straps are flat and don`tmodate for the head`s natural curvature. The 3-d mask strap is a true three-dimensional design forfortably snug fit around your head. With buckles that rotate 180 degrees, this mask fits a variety of head sizes. The rotation of the buckles and the thin frame size allow you to fold this mask intopact size.