Neoprene hatch covers provide a waterproof seal under hard hatch covers - if you use neoprene hatch covers you must have a hard cover over the top to prevent wave implosion.
These are for oval hatches (50 x 31cm, sized to fit the older Mirage Sea Kayaks 530 / 580) - the covers are made from 3mm neoprene with sewn in shockcord around the edge.
We stock other sizes such as 8" round (20cm) and 10" Round. For other oval shapes and non-oval custom shapes we can arrange to have hatch covers made up - see our Neoprene Hatch Covers - Custom page. We will usually require you to send us a template of the hatch to ensure a proper fit and they will take a few weeks to create.