Remain cool and dry the whole night through using this Bedgear Dri-Tec 5.3 Performance mattress protector on your twin extra-long mattress. Featuring a new hexagonal pattern on the Dri-Tec fabric, this bed cover keeps moisture and heat away from your sleeping body. A flexible surface allows the protector to shift and adjust with your movements so you don't feel stuck in bed. Meanwhile, the high-stretch skirt fits beds up to 18 inches high, while the Powerband® keeps the protector in place. Finally, the waterproof triple layer protection saves your mattress from water spills and allergens.