1、The face part is fitted with single-sided laminated sponge for better fit. 2、Bonding blind seam technology, the level of anti-seepage water is better. 3、Air holes are provided on the top of the head to facilitate the discharge of air bubbles after entering the water. 4、Additional knot at the seam, support DIY trim, suitable for all kinds of face shape, avoid the trouble of loose line. 5、The face is rubber lined, more tightly fitting, reducing water ingress. Features: The face part is fitted with single-sided laminated sponge for better fit. Bonding blind seam technology, the level of anti-seepage water is better. Air holes are provided on the top of the head to facilitate the discharge of air bubbles after entering the water. Additional knot at the seam, support DIY trim, suitable for all kinds of face shape, avoid the trouble of loose line. The face is rubber lined, more tightly fitting, reducing water ingress. Specification: Brand: SLINX Material: 906 neoprene + 1096 nylon Thickness: 3mm Size (Optional) M L XL Head Circumference 54 ~ 56cm / 21.3 ~ 22in 55 ~ 57cm / 21.7 ~ 22.4in 56 ~ 58cm / 22 ~ 22.8in Package List: 1 x Diving Cap Note: Please allow slight error due to elastic materials. Thanks for your understanding.