This is the Gen 4 Neoprene Jackets for more stable mash temperatures and heat retention. Made with 8mm thick neoprene and improved recirculation pipe insulation on both the boiler and the recirculation camlock arm.
If you brew outside where it is cold or windy, the Neoprene Jacket is a must in preventing heat loss and speed up your brew day.
You could easily adapt this to the 65L DigiBoil, you will just need to cut a hole for the ball valve.