Thanks to the thin thickness of just 1.5 mm, little ballast is needed to compensate for the buoyancy of this suit. The collar is smooth both internally and externally and adheres perfectly to the neck avoiding water infiltration. The diameter of the collar is adjustable with an overlapping hook-and-loop area. The zip is positioned on the back of the wetsuit and its closure takes place from bottom to top via a flat nylon strap. Under the zip there is a neoprene strip which serves to prevent water from entering once it has been closed. All the neoprene pieces that make up the wetsuit have been glued and then reinforced with internal non-passing seams in order to leave the exterior totally smooth and friction-free in the water.