Replacement Latex Neck Seals, suitable for scuba diving and sailing (surface) drysuits and comes in five sizes. The seal can be trimmed to suit neck size.
Please note some people are allergic to Latex and can have a reaction to wearing latex against the skin. To avoid this we recommend using a neoprene seal if this is a problem.
Don't forget your 2-part glue and tape to complete the job!