These pillows are amazing at preventing pain in the morning, but they are also amazing at tackling its core causes. The main problems with sleep are addressed: posture, pressure and proprioception. In other words, your ideal sleep starts at the head of the bed, on a pillow that actually supports your head. This enables perfect spine alignment, which is why you wake up feeling so good and rested. If you have never heard of good sleep posture before, you are about to become obsessed with its benefits. Levitex is so sure of its products, it also give you a five-year warranty on the pillow. Dimensions: Small - W: 60cm x D: 40cm x H: 8cm, Medium - W: 60cm x D: 40cm x H: 10cm, Large - W: 60cm x D: 40cm x H: 12cm, XLarge - W: 60cm x D: 40cm x H: 14cm.