All Helix mattresses come with free shipping, a 100-night sleep trial, and a limited lifetime warranty. For the Fourth, we’ve got something special to share: Use code WIRED27 for 27 percent off the entire site. BirchWe aren't headed to a garden center for a birch tree for this one. The Birch mattress line by Helix takes the natural approach to constructing mattresses, with Global Organic Latex Standard latex, organic cotton, and pocketed coils. Essentia's organic mattresses build on materials like certified organic latex and cotton that prioritize aspects like cooling, pressure relief, and lumbar support.