Cal-June Giant Marine Fender Not an inflatable but a 98 closed-cell inner foam core that will never blow-out or sink - even bullet holes will not materially affect its function! Encased in an outer covering of Elastomic Skin up to 516 thick material, some reinforced with nylon mesh plus a urethane skin base, the Jim Buoy Giant Marine Fenders are extremely resilient and able to flex with the rigors of high energy berthing over and over again, providing the user with extended service under all con