Q1/2021 update. Early 2011 Intel started a new class of notebooks called Ultrabook that was definied primarily through a thin case, an energy-efficient Intel processor, long battery life, and a touchscreen display. Henceforth, Ultrabook became the moniker for all particularly portable laptops, and started somewhat of a race to design the thinnest case possible. Find our Ultrabook favorites as reviewed by us below, now with updated criteria.