Available in  03 Sizes [Outer Diameter (X) * Inner Diameter (Y)* Thickness (Z) {in mm}] ~ Small (Neonatal) = [90 X 45 X 20], Medium = [150 X 80 X 30] and; Large = [200 X 100 X 140]  in both green/ blue color options. 
Support's patient's head during prolonged surgeries (air and gel cushioning)
Protect skull, neck and ears in multiple positions by conforming to head's contour