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.
Silicone seal design specifically for the NeckTite/Quick Neck system. Order this size for neck sizes above 36cm. 
Neck seal (silicone) size Standard (for neck sizes above 36cm)

 
NOTE:THESE CAN NOT BE GLUED ONTO DRYSUITS AS THE ADHESIVES DO NOT STICK!!!