Alera mesh backrest – 18-1/8″ x 15-3/8″ x 5-7/8″ – black ergonomically designed stretched mesh backrest supports the lower back. Contoured shape and curves to keep the back in alignment. Breathable mesh fabric keeps the back cool and supported. Adjustable elastic straps secures backrest in place. Great with office chairs, car seats, or in the home. this product arrives to most customers in 2-3 business days.