The BodyFit Foam Collar is made of soft closed cell foam, with a velcro closure for a very secure fit. This design allows the body to be fully submersed, leaving the head out of the water. Use for therapy and rehabilitation. Sizes: pediatric or Adult. The measurements for the Adult are as follows: L-17.5", W-10", diameter of opening - 4", and it is 3.5" thick. The measurements for the pediatric are as follows: L-14.5", W-8", diameter of opening - 3", and it is 2.5" thick. *Please call for business pricing if you have an aquatic related business.