For too long latex seals have been the biggest problem in dry suit diving. You are never sure what state they are going to be in until you open your dive bag. They are easy to rip and prone to deteriorate from factors such as the sun/UV rays, chemicals, and ozone. The 100% Silicone Hypoallergenic Seals will set a new industry standard. With Aqua Lung's Silicone Seal there is no chemical or environmental sensitivity. The elasticity makes donning the suit much easier and it seals with your skin more effectively. Great save-a-dive- kit item and are sold in pairs.