The Seals Cockpit Seal is the most durable choice if your kayak is stored where it gets lots of sun or salt air. 
 
This high-quality vinyl cover ensures a snug fit, blocking dust, debris, and critters, keeping your cockpit clean during storage and transport.
 
Tear-resistant cargo cover material with superior UV protection. which we've found to be the most durable. 
 
Adjustable bungee with rim grip. Hull strap keeps the cover secure. Teather hook.
 
Paddlers looking for a tighter fitting cover should check out the Seals Neoprene Cockpit Cover. 
 
Shown on a white Delta 15.5GT in both 1.4 and 1.7 (1.7 is recommended by seals and easier to put on)
 
Size 1.4 fits Delta Kayaks 12s & 15s
Size 1.7 fits Delta Kayaks 12.10, 14, 15.5GT, 16, 17 & 17.5T (1.4 will be more of a snug fit and a little more difficult to put on.)