Hydrolock neck seal
Developed by fourth element over 8 months of prototyping, this features a unique combination of glideskin, smoothskin and standard neoprene. The double seal virtually eliminates water ingress into the suit.
An internal back panel prevents water entering through the zip from reaching the back. The neck collar is lined with glideskin neoprene and fits snugly around the neck giving a smooth, complete seal. Then as the zip is pulled up, the outer neck seal which has a smoothskin seal, can be adjusted to fit.
The end result - a secure, comfortable seal at the neck, minimal chafing and less water ingress.
