The Seals Cockpit Seal Ultra is made of a durable UV resistant polyester fabric and a great alternative to vinyl.
 
A lighter weight material compared to their Cockpit Seal, made from a mildew and fade resistant marine grade polyester fabric.
 
Rim grip technology
Adjustable bungee cord rim attachment
Hull strap security feature
Double-stitched seams
Tether Hook
 
Size 1.4 fits Delta Kayaks 12s & 15s
Size 1.7 fits Delta Kayaks 12.10, 14, 15.5GT, 16, 17 & 17.5T (If you like a snug fit go with the 1.4)
 
*In the video it is shown in a size 1.4 and 1.7 on a Delta 16.