serta back logic 3 0 eurotop plush king mattress setTossing and turning can ruin a good nights sleep, but with this Back Logic 3. 0 mattress from Serta, youll get the all supportive rest you need. The individually wrapped coils offer support and motion separation, with posturized coils concentrated in the centre third of the mattress to provide the right amount of strength for your weight. Comfort and support foam relieves your body of pressure and enables a cozy sleep thanks to height reducing gel.