DUAL Rail Slip-Free Foam : DUAL Rail attaches to both sides of bed for ultimate safety. Easily adjusts height to fit Queen Full & Twin Beds. Slip-free foam keeps rail snugly in place to provide superior safety. Prevent Falling : The bed rails not only serves as a bed rail for the elderly, but also a bed cane/ grab bar for getting on and off the bed, effectively help the elderly, the disabled, and pregnant women get up independently. Widely Used : Bed railing for seniors can be used for a variety of beds, such as king queen, twin, adjustable bed not recommended. Mattress thickness is recommended between 2 and 8 inches.