The Helix Twilight Luxe with GlacioTex™ Cooling Cover is designed for side sleepers seeking a firm, supportive mattress that actively dissipates heat. Engineered with targeted lumbar support and high-density memory foam, it offers precise pressure relief for hips and shoulders while maintaining a consistent firm feel—reducing sink-in and promoting proper alignment. Key Technical Features Firmness Level: 7.5/10 on the industry scale; minimizes sink, supports side sleepers. Materials: Zoned lumbar support coils, memory foam layers, choice of GlacioTex™ Cooling or TENCEL™ breathable cover. Cooling Performance: GlacioTex™ cover pulls heat away from your body rapidly for overnight comfort. Outperforms standard covers in lab thermal conductivity tests. Height: 14" (2" taller than standard Helix models) for increased comfort and deeper mattress profile. Certifications: CertiPUR-US® certified foams — tested for indoor emissions, durability, and safety standards. Comparison: GlacioTex™ vs. TENCEL™ Cover Feature GlacioTex™ Cooling Cover TENCEL™ Cover Cooling Technology Active heat-dissipating fabric (lab-verified) Ultra-breathable cellulose fiber Feel Cool-to-the-touch Soft and airy Allergen Resistance Moisture-wicking, hypoallergenic Hypoallergenic Suitability for Side Sleepers Reduces pressure on hips and shoulders thanks to precision-zoned memory foam and coil support. Firm feel (minimized give) preferred by customers seeking less body sinkage and greater alignment. Pillow top adds cushioning without compromising support. Frequently Asked Questions What is the best firm mattress for side sleepers who want cooling features?The Helix Twilight Luxe combines a firm support profile with GlacioTex™ Cooling Cover, offering targeted pressure relief for side sleepers and continuous cooling verified by material tests. How does the GlacioTex™ Cooling Cover compare to a regular TENCEL™ cover?GlacioTex™ uses advanced heat-dissipating fibers for immediate, measurable cooling, while TENCEL™ is naturally breathable but less active in thermal transfer, based on independent lab results. Which mattress type helps prevent hip and shoulder pain for side sleepers?Mattresses with zoned memory foam and coil support—like Helix Twilight Luxe—support proper alignment and significantly reduce pressure in clinical studies. Is a pillow top mattress with lumbar support good for people who toss and turn?The extra cushion and zoned lumbar design stabilize the spine and adapt to movement throughout the night, reducing waking and improving sleep continuity. Are firmer mattresses better for people who don't like sinking in while sleeping?Yes. The firm top layers and denser support core of the Helix Twilight Luxe greatly reduce sink-in, consistently meeting preferences in customer reviews. Showroom Experience Try the Helix Twilight Luxe at our NYC and NJ showrooms—designed for customers who want to test comfort and feel in person before buying online. { "@context": "https://schema.org/", "@type": "Product", "name": "Helix Twilight Luxe - Includes GlacioTex™ Cooling Cover", "description": "The Helix Twilight Luxe with GlacioTex™ Cooling Cover is designed for side sleepers seeking a firm, supportive mattress that actively dissipates heat. Engineered with targeted lumbar support and high-density memory foam, it offers precise pressure relief for hips and shoulders while maintaining a consistent firm feel—reducing sink-in and promoting proper alignment. Key Technical Features Firmness Level: 7.5/10 on the industry scale; minimizes sink, supports side sleepers. Materials: Zoned lumbar support coils, memory foam layers, choice of GlacioTex™ Cooling or TENCEL™ breathable cover. Cooling Performance: GlacioTex™ cover pulls heat away from your body rapidly for overnight comfort. Outperforms standard covers in lab thermal conductivity tests. Height: 14\" (2\" taller than standard Helix models) for increased comfort and deeper mattress profile. Certifications: CertiPUR-US® certified foams — tested for indoor emissions, durability, and safety standards. Comparison: GlacioTex™ vs. TENCEL™ Cover Feature GlacioTex™ Cooling Cover TENCEL™ Cover Cooling Technology Active heat-dissipating fabric (lab-verified) Ultra-breathable cellulose fiber Feel Cool-to-the-touch Soft and airy Allergen Resistance Moisture-wicking, hypoallergenic Hypoallergenic Suitability for Side Sleepers Reduces pressure on hips and shoulders thanks to precision-zoned memory foam and coil support. Firm feel (minimized give) preferred by customers seeking less body sinkage and greater alignment. Pillow top adds cushioning without compromising support. Frequently Asked Questions What is the best firm mattress for side sleepers who want cooling features? The Helix Twilight Luxe combines a firm support profile with GlacioTex™ Cooling Cover, offering targeted pressure relief for side sleepers and continuous cooling verified by material tests. How does the GlacioTex™ Cooling Cover compare to a regular TENCEL™ cover? GlacioTex™ uses advanced heat-dissipating fibers for immediate, measurable cooling, while TENCEL™ is naturally breathable but less active in thermal transfer, based on independent lab results. Which mattress type helps prevent hip and shoulder pain for side sleepers? Mattresses with zoned memory foam and coil support—like Helix Twilight Luxe—support proper alignment and significantly reduce pressure in clinical studies. Is a pillow top mattress with lumbar support good for people who toss and turn? The extra cushion and zoned lumbar design stabilize the spine and adapt to movement throughout the night, reducing waking and improving sleep continuity. Are firmer mattresses better for people who don't like sinking in while sleeping? Yes. The firm top layers and denser support core of the Helix Twilight Luxe greatly reduce sink-in, consistently meeting preferences in customer reviews. 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