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At 76" by 80", a Serta king size mattress gives you the most sleeping area. While the king size bed didn't appear on the market until relatively late–the 1960s, in fact–it's become a popular size, accounting for around 20% of mattress sales. In the 50 years since the introduction of the king size bed, mattresses have come a long way. Serta king mattresses offer the latest in sleep technology, giving you plenty of room and plenty of features to help you sleep.