http://www.dmedirect.com/aspenvista... Our Aspen Vista collar fits virtually every size and shape of neck with the twist of a simple adjustment dial on the front of the product. No more worrying about which size collar to buy the Aspen Vista is designed to be simple.This cervical collar is soft and comfortable for all day wear. Check out this video to see how easy it is and click on our link at the end to receive your personal discount with purchase. Neck braces and c collar product provide more support over soft cervical collar products and the Aspen neckbrace is our #1 c collar for cervical collar types of products.