(Image credit: Helix Sleep) Over the last few years, I've been lucky enough to experience the spine-supporting luxury of Helix mattresses first-hand. That's why I was happy to see Helix offer shoppers more of its signature back pain relief with the release of the ErgoAlign Mattress Topper, now $399 for a queen at Helix . My fellow mattress testers and I have tried all five of the literal slices of luxury known as Helix's cooling mattress topper line-up. At a glance The Helix ErgoAlign Mattress Topper is designed to support those with lower back pain. The ErgoAlign Layer features high-density foam for extra support around the mid-section, encouraging healthy spine alignment. Our lead tester was impressed with how the ErgoAlign Layer provided immediate relief for her back pain. The cover is made from GlacioTex, a specialist cooling fabric that dissipates heat. While the GlacioTex cover provided cooling comfort, the cover is non-removable and can feel slippery.…