This mattress boasts a dual firmness design—Firm (ventilated gel-infused memory foam) and Extra Firm (high-density bamboo charcoal foam)—allowing free switching to suit your sleep preferences, relieve waist and neck pressure, and ensure spine alignment. Its bamboo fiber cover wicks moisture and sweat quickly, paired with breathable gel foam and antibacterial bamboo charcoal foam to keep you cool and fresh all night.Certified by CertiPUR-US and OEKO-TEX,it is free of fiberglass,harmful chemicals and odors; the zippered removable cover supports machine washing for easy care.Equipped with bottom non-slip beads and adjustable straps, it stays stable without displacement,while 8 mainstream sizes (Twin, Twin XL,Full, Queen, King,) with rolled packaging fit family bedrooms,guest rooms,RVs,dormitories and more,meeting all your daily and temporary sleep needs. Color: Gray.