This is the SI Tech Silicone Neck Seal for Drysuit Neck Tite systems Features: Super Easy to Install Utilized for Personal and Rental Gear Quick Exchange Neck Seal System: Can-Be-Fitted in Minutes w/o Glue Silicone: Extremely Durable, Exceptionally Strong and Flexible The SI Tech Silicone seal is super easy to install and can be utilized for personal and rental gear. This quick exchange neck seal system can be fitted in minutes without the use of glue. Silicone neck seal for dry suits is extremely durable. Exceptionally strong and flexible sealing system quick exchange allows you to provide a custom-fit neck seal for rental or school customers.