Describe: Size: S: 10-12(cm); underwater activities. Color: subject to the picture. Material: Silicone + PVC. Please. Application: For diving, swimming, snorkeling, etc. notes: Put on your diving mask and put your head in the water to make sure No water enters the mask. Breathe naturally when the dry top is on the water. Put your finger in the gap between the mask and chin, and push Apply the mask to your face, then remove the mask. [pack] Snorkeling mask × 1 hint: *Due to manual measurement, there may be some errors, please allow 1-3 cm (1 cm = 0.39 inches) difference, thank you. *Due to spotlights and different people's different understanding of color, there may be certain colors, but within a reasonable range, please choose carefully.