Twin Gold Bond 4 Inch All Cotton Mattress An ideal starter futon mattress Made from 100 percent Joy cotton batting 4 in. Twin Mattress: 39 in. W x 75 in. D (40 lbs.) 4 in. Twin Mattress: 39 in. W x 75 in. D (40 lbs.) 4 in. Twin Mattress: 39 in. W x 75 in. D (40 lbs.)