A soft seamless acrylonitrile bladder having excellent air permeability combined with good bounce characteristics for inflatable balls obtained by latex dipping process. The said process involves dipping hot molds in a coagulant bath of calcium nitrate and water and later dipping the dried, coagulant coated formers in a compounded latex bath of carboxylated acrylonitrile butadiene latex, the dip being single or multiple depending upon the desired wall thickness. The said latex dipping process allows low manufacturing cost, high productivity and low rejection rate bladders having uniform weight varying from 500 mg/inch.sup.2 to 1.5 g/inch.sup.2, modulus varying from 17 to 20 Kg/Cm.sup.2, tensile strength of 150-180 Kg/Cm2 and elongation at break 650-750%.