The SleepSafe Low twin size bed is designed for both children and adults who need the protection of full length safety rails. Its safety rails ranges up to 17.25" above the mattress depending on the foundation choice (Fixed, Manual, Articulated, Hi-Lo). It exceeds the FDA guidelines on the 7 Zones of Entrapment found in traditional hospital beds, creating a safe and comfortable environment for everyone as it virtually eliminates entrapment issues and falls. Optional padding is also available as well as optional break-resistant windows for the headboard and/or footboard. Also, the mattress is a memory foam mattress with gel polymers infused throughout the memory foam.