The Smirthwaite Cocoon Sandals with Velcro can be used with many Smirthwaite special needs chairs and special needs standers. Each sandal has fabric that envelopes the feet with a Velcro strap that crosses over the top of the foot. There is also a strap behind the heel to help control the foot position. Sold as a pair. Please refer to the Measuring Guide under the main product image on this page for assistance in choosing the size of the sandal.