Promate Sea Slender mask (MK275) is good for snorkeling. It fits medium face which facial seal size is Wide 4-1/2″ * Height 3-3/8″. It features crystal, liquid silicone injected skirt and strap, double edge comfort seal, low volume, swival and adjustable buckles. Moreover, prescription (Rx) lens (OP270) is available in our product line for this model. RX Tempered Lens will be installed in the brand scuba mask by certified techanician.

The lens is tempered glass, which is a type of safety glass processed. Tempering creates balanced internal stresses which cause the glass, when broken, to crumble into small granular chunks instead of splintering into jagged shards. The granular chunks are less likely to cause injury. Comparing with polycarbonate lens, it is usually heavier than the polycarbonate, but the polycarbonate is easier scratched.

If you have different prescription strengths for each eye, please follow the steps below:
1. Please select “Different Strenth for Each Eye” or if there’s no prescription choice, just go ahead and make the purchase.
2. You will not be prompted for more information, but you will be given an order number.
3. Send us an email to [email protected] with your order number and a copy of your prescription, or what you would like for your right and your left.
4. Someone on our team will get back to you confirming that they’ve received the prescription information.

These corrective lenses are designed for off-the-shelf correction. These lenses are not for those with more complicated vision problems such as astigmatism (correction needed for both near and far away) or double vision.