Our Super Firm Mattress is an amazing choice for all back- sleepers as it keeps your feeling, light, breezy, and firmly grounded during all your dreams! Features: Cotton cover - The smooth cotton cover of this mattress ensures a 100% organic weave and holds all your sheets tight and snug. 5-zone pocket spring system - This mattress is inlaid with an amazing 5-zone pocket spring suspension that redistributes all your body weight, making sure to relieve all the pressure off your body. Charcoal infused - The foam of this mattress is infused with charcoal, so it's got an elevated anti-bacterial, anti-dust mite, and anti-allergen composition! 6-turn coil & individual pocket spring - The 6-turn coil system and individual pocket springs of this mattress provide an excellent cushioning effect that also prevents any future sagging! No harmful additives - This mattress is OEKO-tex and Certipur-US certified, so you can rest assured that it contains NO harmful chemical additives! Specifications: Size - Double Double Dimension - 138W x 188L x 34H (cm) Thickness - 34 cm Comfort / Firmness - 8/10 Firm Cover - Breathable, Organic Knitted Cotton Foam - High Density Charcoal Infused Foam Spring/ Coil System - 5 zoned pocket spring, 6 turn coil Zero Harmful Chemical - Certified with CertiPUR-US Hypoallergenic - Certified with OEKO-TEX Additional Certification - STC Certified Spring/ Coil System - 5 zoned pocket spring, 6 turn coil Pressure Tested - More than 500,000 times before production Package Content: 1 x Mattress 1 x Assembly Instruction Packaging - Compressed & Rolled, in a box