King size bed frames are the most popular bed size for couples in the UK. Size matters, and in choosing a mattress which measures 150cm x 200cm, the supporting bed base means you will have more space to sleep in.In terms of sleeping area, however, you might want to consider an adjustable king instead. These bases provide the equivalent couple's sleeping space of a standard king size mattress, but with one big difference: each sleeper has their own small single mattress measuring 75cm x 200 cm. Each mattress is supported by a motorised adjustable mechanism with its own individual infra-red hand set. For that extra touch of luxury, TEMPUR® adjustable bases include massage units as standard.