These Silicone Drysuit Seals are for replacement if you suits neck seal becomes torn. 

SILFLEX Silicone Neck Seal is for use with Bare and Aqualung Drysuits, and other brands of drysuits that feature the neck tite ring silicone neck seal.

Silicone Neck Seals are constructed from hypoallergenic silicone that has 40 % better stretch and offers enhanced comfort compared to latex seals. Divers with latex allergies can dive carefree, knowing that the seals are non-allergenic. The seals are durable and resistant to degradation by UV light, ozone or chemicals. The elasticity makes donning the suit much easier and it seals with your skin more effectively.

Available in two sizes: Small and Standard.

Available in two colours: Black and Cyan blue.

These Silicone seals from Hollywood Divers are not to be glued to the suit and meant to go with the Neck Tite system.