The Helix Twilight Luxe is a premium firm mattress designed for side sleepers to help relieve back pain and achieve deep, restorative sleep. Our SupremeSupport 4.0 Memory Foam (4x denser than typical mattresses) works with zoned lumbar support to keep your spine aligned and your shoulders and hips cushioned, so you wake up feeling great. On a scale of 1-10 where 10 is the firmest, the Helix Twilight Luxe feels like an 8: it’s uplifting without too much give.