3 sizes, minimizes lateral leaning in wheelchairs & most other chairs. Foam-padded sides adjust laterally for a custom fit. Will not interfere w/resident’s ability to reach wheelchair hand-rims. Wipes clean for easy care. #706050-Sm 14-19" Back Pad-10"Wx12"H #706055-Md 16-23" Back Pad-13"Wx16"H #706059-Lg 22-23" Back Pad-18"Wx22"H Latex Free UNSPC#42191819