Multi-layer golf balls having moisture barrier layers based on polyalkenamer compositions

A golf ball, comprising:

• a dual-core comprising an inner core and outer moisture barrier core layer, wherein the outer core layer surrounds the inner core, the inner core having a diameter of about 1.51 inches to about 1.58 inches and a compression of about 100 or less, the inner core being formed from a first rubber composition and the outer core layer being formed from a second rubber composition, the second rubber composition comprising a polyalkenamer in an amount of at least 50 weight percent;
• the outer core layer having a thickness of about 0.01 inches to about 0.06 inches and outer surface hardness of about 80 Shore C or greater, wherein the outer core has a moisture vapor transmission rate lower than that of the cover;
• and
• a cover layer surrounding the outer core layer, the cover layer being formed from a composition comprising polyurethane;
• polyurea;
• or a hybrid, copolymer or blend of polyurethane and polyurea and having a material hardness of about 30 to about 65 Shore D.